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{{talk header}}
{{Vital article|level=4|topic=Science|class=B|subpage=Physics}}
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== Luminosity ==
|action3date = 2020-06-30
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{{ping|Cron11|Lithopsian}} I wonder whether we should just delete the sentence - its luminosity has been measured at 120,000 or 279,000 times that of the sun...clearly does overlap with Betelgeuse (though I do suspect brighter), hence we can't really rank the stars anyway. ] (] '''·''' ]) 10:01, 23 January 2019 (UTC)
|maindate=September 28, 2020
:I feel that this sort of ranking, other than in the most blatant and reliable (and cited) cases, is unhelpful and impossible to maintain. ] (]) 16:13, 23 January 2019 (UTC)
|topic = Physics and astronomy
::I removed it - it was uncited anyway. ] (] '''·''' ]) 20:07, 23 January 2019 (UTC)
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== Buffing to GA-hood ==


== Absolute magnitude ==
Hey {{ping|Lithopsian}} what you reckon about buffing this one to GA-hood, which will act in sorts like a Stable Version? I was abit baffled by results, which make it considerably less luminous than some others. Would be good to put all results and how they were derived. I do like it when we embrace uncertainty but showing how different results are derived and the certainty of 'knowing' them. ] (] '''·''' ]) 19:36, 24 January 2019 (UTC)


Rigel is actually a multi star system. But the energy output of its components other than the main star are negligable. Its average apperent magnitude is m=0.13 and the distance is d=860 ly. With these figures its absolute magnitude should be M= -6.97 . But the article gives the figure as M= -7.84. Have I missed something? ] (]) 14:42, 6 January 2021 (UTC)
PS: There were a few new papers in 2017-18 that looked like they study some interesting stuff like and of larger group. ] (] '''·''' ]) 19:37, 24 January 2019 (UTC)
:Yes, you missed something. First, the references given for the apparent magnitude, the distance, and the absolute magnitude are not the same, so they are not necessarily consistent. In fact the reference for the absolute magnitude (which I just changed to the original paper that derived the value instead of one that was just quoting it) assumed a distance of {{val|360|u=pc}}. There is also extinction, which many people forget about. In this case it isn't obvious how many magnitudes of extinction have been included in the calculation because the paper goes directly from the distance modulus and colour excess to the absolute magnitude. However, the difference between the distance modulus and the absolute magnitude makes it fairly clear that there are about 0.16 magnitudes of extinction in there. That is consistent with the E(B-V) of 0.05. ] (]) 17:27, 6 January 2021 (UTC)


== Distance ==
:I'll certainly try to improve things. I started off seeing the new papers, but then found a lot of what was there already needed tidying up. The low luminosity is a surprise: it comes mainly from a lower temperature, the radius is very much in line with previous results. It is hard to criticise the temperature, it is newly derived using model atmospheres and SED fitting. This is way out of line with more previous results, but also a different method to the previous results which tend to use spectra rather than SED fitting. A trivial calculation from brightness and distance ({{val|260|20|u=pc}} from Hipparcos), even assuming no extinction which is thought to be the case for Rigel anyway, and taking any remotely sensible bolometric correction for a B class supergiant, gives a luminosity a little over {{solar luminosity|100,000}}. It isn't a coincidence that this is the number derived by earlier studies, but assuming the distance is correct it sets an absolute lower bound for the luminosity, suggesting that the new result is flawed. Roll on Gaia. I'm thinking to discuss the new results in the text but not put them in the starbox, much as I hate to "ignore the data". ] (]) 20:30, 24 January 2019 (UTC)
::Yes - I think it is important to include it and hopefully there is a subsequent paper that clarifies why it is wrong. Luckily kisa are only preoccupied with superlative or exaggerated results...] (] '''·''' ]) 19:40, 25 January 2019 (UTC)
::" Roll on Gaia." Eh? Gaia accuracy for stars above 4th magnitude cannot be measured. Rigel has no Gaia data. Just saying. ] (]) 01:45, 30 January 2019 (UTC)
:::"The 230 brightest stars in the sky (G < 3 mag, loosely referred to as very bright stars) receive a special treatment to ensure complete sky coverage at the bright end" and "it is expected that a single-measurement precision of 100 μas will ultimately be achievable, which corresponds to end-of-life astrometry with standard errors of a few dozen μas".<ref>{{ Citation | author = T. Prusti | collaboration = GAIA Collaboration | date = 2016 | title = The ''Gaia'' mission | type = forthcoming article | journal = Astronomy and Astrophysics | doi = 10.1051/0004-6361/201629272 | bibcode=2016A&A...595A...1G | volume=595 | page=21 | arxiv = 1609.04153 }}</ref> So Rigel isn't in DR2, but will be in the final catalogue, with a precision that should comfortably exceed Hipparcos and at the very least confirm or contradict previous parallaxes. ] (]) 17:33, 30 January 2019 (UTC)
::::Wow, can hardly wait....] (] '''·''' ]) 03:34, 31 January 2019 (UTC)
::::Again. Clutching straws here, eh? Distance requires a parallax. DR3 will still have nothing but an estimate of Rigel's position. That's the whole point. ] (]) 04:34, 31 January 2019 (UTC)
:::::How do you figure that? ] (] '''·''' ]) 07:51, 31 January 2019 (UTC)
::::::: Clearly. "So Rigel isn't in DR2, but will be in the final catalogue, with a precision that should comfortably exceed Hipparcos and at the very least confirm or contradict previous parallaxes" is another false statement. The brightness of the star (and those above 3rd magnitude) greatly exceeds the threshold of the detector. ] (]) 02:23, 2 February 2019 (UTC)
::::::::Suit yourself if you aren't going to listen or learn, but for the information of others here's an update paper on Gaia and very bright stars<ref>{{cite journal|bibcode=2016SPIE.9904E..2ES|title=Enabling science with Gaia observations of naked-eye stars|journal=Space Telescopes and Instrumentation 2016: Optical|volume=9904|pages=99042E|last1=Sahlmann|first1=J.|last2=Martín-Fleitas|first2=J.|last3=Mora|first3=A.|last4=Abreu|first4=A.|last5=Crowley|first5=C. M.|last6=Joliet|first6=E.|year=2016|arxiv=1605.08347|doi=10.1117/12.2231240|series=Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave}}</ref> and a with nice pictures. ] (]) 16:56, 2 February 2019 (UTC)
{{talkref}}
:::::::::Clearly facts trumps speculations. Sadly the inherent errors by Gaia become larger for bright stars, becoming likely on par with HIP. I.e. 1 mas. Your linked reference clearly concludes: "Virtual object synchronisation may mitigate some of those problems for the 50 stars brighter than G=1.75.
" The problems in reduction and calibration of GAIA data in the case of bright stars (above 3rd magnitude) are not simple, and these given references point this out. If you read pg.9-10, Gaia could not detect the star's core to get any astrometry, and this was for stars with G magnitudes between 1.1-5.0. Rigel is bright than 1.1G magnitude (they define it as an ultra-bright stars BTW. ). They even summise "The final astrometric error of these observations will be the sum of the formal precision and the residual calibration error, which will therefore be larger than the numbers derived as the ultimate limit from the Cramer Rao lower bound. <b>Here, we do not quantify how well these data can be calibrated.</b>" (My bold.) If you read the conclusion (pg.11), they say: "We presented a technical solution that would allow the collection of Gaia astrometric and spectrophotometric data for extremely bright stars (G < 2).'" this does not include Rigel. Worst it is unclear with their method will be adopted with GAIA mission. e.g. "It is however not yet clear whether this mode will be adopted for the remainder of the Gaia mission." (pg.11).
:::::::::Your claims of me not understanding the sources are unjustified. Simply, the misleading statements criticised by me are quite justified.
:::::::::Another gross error is your edit saying "Remove Simbad-specific codename." Actually it is the name of the variable in GVSC, and was added to counter this incorrect statement that Rigel has no variable star designation. It does. (I have now restored this.)
::::::::::NOTE: Good to see another anon IP present an argument and attempt to deride an argument based solely a series of edits on Rigel alone. Suspicion infers this is likely socking to avoid legitimate scrutiny, made worse by the evidentiary discussion and criticism here. Are you a sock of ]? ] (]) 00:54, 3 February 2019 (UTC)
Maybe we can get back on track for making this a good article? ] (]) 19:04, 9 April 2019 (UTC)
:Still some stuff to sort out....] (] '''·''' ]) 13:33, 10 April 2019 (UTC)
:I tried to copyedit through the changes of the last couple of days, but ended up reverting some of it completely, so that might need going through again. It doesn't feel like we're getting any closer, just seems like the same problems going round day after day. ] (]) 15:05, 12 April 2019 (UTC)


The first paragraph gives a distance of 860 light-years (260 pc) from Earth.
== Enough now? ==
Yet the sidebar lists Distance 1,010 ± 20 ly (309 ± 5 pc).
] (]) 14:15, 15 September 2021 (UTC)
:Thanks for pointing that out. I took a look and it seems that the infobox value was obtained using another method, but the value of 860 ly (863, to be exact) is the more widely accepted value. I have updated the infobox and added a reference. -'''] ]''' 18:54, 15 September 2021 (UTC)
::The distance isn't consistent now to the measured parallax - which i think is a pretty accurate method for this distance. The simbad database also states that the Parallax is actually 3.78 (compare: https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Rigel). Should the parallax be changed to reflect this value? Or is the gaia data which was used for the 3.2 value more accurate? ] (]) 07:18, 13 February 2023 (UTC)
:::The parallax in the starbox is for Rigel B. It should probably have a note to that effect since it isn't obvious from the reference. Yes, it is fairly accurate, but it is also somewhat indirect and potentially doesn't reflect the actual distance of Rigel. The parallax shown at Simbad for Rigel A is the old Hipparcos parallax because Gaia can't yet provide a useful parallax for such bright stars. The Hipparcos value is still widely-used as the "reference" distance for Rigel. ] (]) 14:51, 13 February 2023 (UTC)


== Pronunciation ==
Do you think there is enough coverage now? Time to polish? ] (]) 21:07, 1 February 2019 (UTC)


I would rhyme this with Nigel, but is that correct? Would it be a hard G? <!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding ] comment added by ] (]) 07:12, 2 January 2022 (UTC)</small> <!--Autosigned by SineBot-->
:This article still has more than a few dozen gross errors, which need to be corrected. (I've just correct the variable star designation that appears in the GCVS5.) It remains below ] standards based on poorly sourced or over used references for cites e.g. Kaler and Schaff. John Herschel first discovered in 1839 that Betelgeuse was sometimes brighter than Rigel. Webb (and several others) have said in the 19th Century "…has speculated that maybe it was during a rare period where it was outshone by Betelgeuse resulted in the latter star being Alpha and Rigel Beta Orionis." Kaler just repeated it. It is also fits uncontroversial knowledge as stated in ].
:I rhyme it with Nigel, the 'g' as in jam. Some pronunciation guides give a hard 'g', but I haven't heard this actually being used. ] (]) 17:38, 2 January 2022 (UTC)
::I have removed the tag - Herschel (1840) doesn't speculate on the Bayer designations. I don't know the Webb citation. Just because Kaler mentions it does not mean he came up with the idea. Hence the statement and source are true. If you find an older source speculating on the same issue you are welcome to add it. If you can't then it stands as the best available reference. In any case it doesn't warrant a {{dubious}} tag, which is missing the point. ] (] '''·''' ]) 12:36, 3 February 2019 (UTC)
::And that corresponds to the tri-literal root RJL of the Arabic name (ar-Rijl al-Jauza, the foot of the giant). -- ] (]) 18:27, 2 January 2022 (UTC)


== Evolutionary stage ==
:As for the 2nd paragraph of 'Nomenclature' it verbosely/garrulously says:
::"In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN, which included Rigel for the star β Orionis A. It is now so entered in the IAU Catalog of Star Names."
:Simply write:
::"In 2016, Rigel or β Orionis A. was entered in the IAU Catalog of Star Names."
:Here GA requires "<i>They are well written, contain factually accurate and verifiable information.</i>" This article presently fails on all three counts!! ] (]) 02:12, 2 February 2019 (UTC)
:::What are you saying is the original reference/person for proposing that the Bayer designation occurred at a (rare) time when Betelgeuse outshone Rigel? ] (] '''·''' ]) 02:39, 2 February 2019 (UTC)


:::PS:Text can't be "garrulous" as it is written not loudly spoken - the word you (presumably) want is verbose. Also, feel free to list ''specific'' errors as you find them. ] (] '''·''' ]) 02:40, 2 February 2019 (UTC) The sidebar says that Rigel is on the main sequence but the text says that it has evolved away from the main sequence. Presumably the text is correct ] (]) 11:20, 21 March 2022 (UTC)
:The sidebar says that the faint companion, or at least one component of it if it is a binary, is on the main sequence. It describes the primary star (component A) as being a ]. ] (]) 20:36, 21 March 2022 (UTC)
::::"garrulous" can mean long-winded or wordy BTW. Its antonym is "concise".

:I note the stated magnitudes are mostly wrong, especially as the Guinan et al. (Ref 4) is quoting the range of 0.05 to 0.18 from another unnamed source. (They didn't measure it BTW) . Even Moravveji, et al. (2012) Vmag of ~0.12 was only derived over 27.7 days. Its range appears as 0.17p-0.22p in GCVS (2009), from 0.17-0.22 Hpmag (1991) in a period of 2.07 days, and 0.03:V-0.30:V NVS (1981). A better mean visual mag is +0.08 from uvby&beta; results (no extinction problems) from Hauck (1997) (as uvby98 100034085) than +0.13 from Ducati (2002) "Catalogue of Stellar Photometry in Johnson's 11-color system.", which has questionable extinction especially with a nearby reflection nebula. ] (]) 04:30, 2 February 2019 (UTC)
::Simple - we can put in both - can you write in plain English how the two results are derived? ] (] '''·''' ]) 04:56, 2 February 2019 (UTC)

::Guinan got their results from in 1985 of observation over 18 nights. I have expanded how they got that. ] (] '''·''' ]) 19:54, 4 February 2019 (UTC)
:::Its tricky. Very few reliable sources publish a range of variability in the V filter. Guinan does, although is a bit lax about explaining where it came from. He's done the photometry, but it isn't clear which photometry was used or whether it was just a general guess from literature values. The NSV (sic) catalogue is a possible alternative. The results are just a crude min/max of extreme values from the literature, not necessarily consistent with eachother, but could be considered comprehensive. Difficult to cite though, because they've been removed from the latest versions of the online tables. As for the "mean" magnitude, Simbad lists Ducati and that's good enough for most people. +0.12 was in Simbad for a long time, is in many catalogues such as the Bright Star Catalogue, and is still widely quoted. Quite how much of a mean it really is is open for discussion. Hauck is definitely a mean, of one value from the 1970s, so we should ignore that. The GCPD is a comprehensive catalogue of photometry and they publish a weighted mean in the UBV system of +0.138 (in GCPD2), as well as showing all the underlying published values. Hipparcos doesn't publish V magnitudes, but their Hp results suggest a considerably fainter range. The Tycho Vt magnitude is close to V and can be converted to within a few hundredths, suggesting a V magnitude of +0.28. Older photovisual magnitudes that should be close to the V system give results around +0.30, for example the HD catalogue at +0.34. I can't find any reliable sources discussing these possible discrepancies, for example as a secular change in brightness, larger range in the past, inaccuracies in some older data, or simply very erratic variations with rare bright and faint periods. Some (most, to be honest) of these magnitudes are for the combined ABC system, but the difference from A alone is tiny. I'm not sure we need to change anything in the starbox, except possible using the NSV numbers for the variable range. Discussion in the text would be difficult because there are no sources to cite, other than throwing out a whole slew of numbers which we shouldn't read too much into ourselves. ] (]) 21:50, 4 February 2019 (UTC)

===Evolution?===
Is it worth mentioning paper where Saio et al debate whether or not Rigel (and Deneb for that matter) have already passed through a RSG stage? ] (] '''·''' ]) 04:41, 2 February 2019 (UTC)
:Added. I was deliberately avoiding this since it hasn't really been picked up on or confirmed, but I added some text that isn't too absolute. ] (]) 21:27, 4 February 2019 (UTC)
::Yeah...to me it seems a little counterintuitive for some reason. They're basing it on some incongruous results and argue in their own paper it could be either anyway. ] (] '''·''' ]) 21:56, 4 February 2019 (UTC)
:::There is a later paper, "solving" the CNO puzzle, but it still isn't widely-accepted that these are post-RSG stars. Most papers, implicitly or explicitly, treat them as coming straight from the main sequence to the BSG state. ] (]) 22:24, 4 February 2019 (UTC)

===Mass loss?===
Chesneau's 2010 study is quoted by Moravejj. There is also a study to look at. ] (] '''·''' ]) 20:13, 4 February 2019 (UTC)
:I'll have a read and see about expanding that section. Might take a while, I haven't read that paper before. ] (]) 21:28, 4 February 2019 (UTC)
:I put something in that I think will be informative and hopefully not too abstruse. ] (]) 18:11, 6 February 2019 (UTC)
::{{yo|Lithopsian}} that reads well. Would 'loop' be a link to ]? ] (] '''·''' ]) 09:50, 26 February 2019 (UTC)
:::Close enough. I linked it. ] (]) 15:50, 26 February 2019 (UTC)

===More pictures?===
<div style="float:right; width:200px; border:solid black 1px; text-align: center; margin: 8px; padding: 4px; font-size: 90%;">
{{chart/start}}
{{chart|border=1|, |- |- |S1|S1='''A''' }}
{{chart|border=0|! | | |PA|PA=Separation=9.5″; Period=24,000&nbsp;y }}
{{chart|border=1|( | |, |S2|S2='''Ba''' }}
{{chart|border=0|! |, |( |PB|PB=Separation=0.58&nbsp;mas; Period={{Val|9.860|u=days}} }}
{{chart|border=1|` |( |` |S3|S3='''Bb''' }}
{{chart|border=0| |! | |PC|PC=Separation={{Val|0.1|u=arcsecond}}; Period=63&nbsp;y }}
{{chart|border=1| |` |- |S4|S4='''C''' }}
{{chart/end}}
Hierarchy of orbits<ref name=tokovinin>{{citation
| first1=A. | last1=Tokovinin
| title=HR 1713 | date=October 8, 2018
| work=Multiple Star Catalog
| url=http://www.ctio.noao.edu/~atokovin/stars/stars.php?cat=HR&number=1713
| accessdate=2019-02-26 | postscript=. }}</ref>
</div>
There are some pictures, but I think maybe one or two more might be good with all the extra text now. There's a whole category for Rigel at Commons, but nothing jumps out as being essential for the article. ] (]) 18:13, 6 February 2019 (UTC)
::Agree..it's slim pickings there. I hate the blue sphere depictions as there is no guarantee it is round like the Sun. ] (] '''·''' ]) 23:15, 6 February 2019 (UTC)
::: Moravveji et al. (2012) says, "Chesneau et al. (2010) ... speculate that Rigel is observed with its rotation axis along the North-South direction at significantly high inclination angle" and "Assuming a high inclination angle, the rotation velocity is well below 20% of the estimated critical breakup rotation rate of ~185 km/s, so spherical symmetry can be safely assumed for its geometry." I think that might allow us to use a simple blue sphere illustration. The article probably also needs a sentence or two on its rotation. ] (]) 20:40, 15 February 2019 (UTC)
:::: I am lukewarm to mildly negative on the idea but if {{ping|Praemonitus|Lithopsian}} are keen for a pale blue ball image then ok.... ] (] '''·''' ]) 09:53, 26 February 2019 (UTC)
: Would it make sense to have an orbital heirarchy chart like the one on ]? I'm not clear that the heirarchy is fully understood though. ] (]) 15:32, 26 February 2019 (UTC)
:: Would be good. Although the hierarchy isn't 100% clear, there is a reasonable current consensus along the lines of . We can, and do, describe the uncertainties in the text. ] (]) 15:48, 26 February 2019 (UTC)
::: Draft version posted above. Please correct if needed. Thanks. ] (]) 22:40, 26 February 2019 (UTC)
::::: I think this is a great idea. ] (] '''·''' ]) 04:24, 27 February 2019 (UTC)
{{clear}}
<div style="float:right; width:240px; border:solid black 1px; text-align: center; margin: 8px; padding: 4px; font-size: 90%;">
{{chart/start}}
{{chart|border=1| |, |S1| |S1='''A''' }}
{{chart|border=0| |! |PA|PA=Separation=9.5″<br/>Period=24,000&nbsp;y }}
{{chart|border=1| |( | |, |- |S2|S2='''Ba''' }}
{{chart|border=0| |! |, |( |PB|PB=Separation=0.58&nbsp;mas<br/>Period={{Val|9.860|u=days}} }}
{{chart|border=1| |! |! |` |- |S3|S3='''Bb''' }}
{{chart|border=0| |` |( |PC|PC=Separation={{Val|0.1|u=arcsecond}}<br/>Period=63&nbsp;y }}
{{chart|border=1| | |` |S4| |S4='''C''' }}
{{chart/end}}
Hierarchy of orbits<ref name=tokovinin/>
</div>
::::::How about more like this? More hierarchical, although wider. ] (]) 18:15, 27 February 2019 (UTC)
:::::::This new version is clearer. I like it ] (] '''·''' ]) 13:43, 28 February 2019 (UTC)
:::::::: Yes it looks clearer now. Thanks. ] (]) 16:20, 28 February 2019 (UTC)
:::::::::{{ping|Praemonitus|Lithopsian}} I can't find anything on Beta Orionis D apart from in Kaler, who suggests (if it is indeed part of the system) that it has an estimated orbit of 250,000 years. Is it worth putting this on the system chart in a different colour, noting it to be only a possible member? ] (] '''·''' ]) 14:25, 12 March 2019 (UTC)
::::::::::Its what we'd call original research, except it has actually been published by somewhat reliable source outside Misplaced Pages. I don't think you'll find any other sources, there just isn't enough information known to make a reliable guess. The orbital period really is quite speculative, making massive assumptions about its distance in front or behind Rigel. The "quarter-million years" is actually a minimum orbital period, assuming the system is even gravitationally bound. For other properties, Gaia DR2 has published a temperature, radius, and luminosity, based on its colour, brightness, and distance. It is shown as slightly cooler, larger, and more luminous than the sun. I condensed this into one word, "sunlike", but we could say slightly more if you want. FWIW, Gaia DR2 places it about {{val|40|u=pc}} beyond Rigel based on the Hipparcos distance for Rigel. Or {{val|40|u=pc}} closer than Rigel B based on its more accurate Gaia parallax. ] (]) 17:37, 12 March 2019 (UTC)

The problem with pictures on this article, or on pretty much any article about a star, is that there's hardly a selection of pictures to choose from. Because the star is so unimaginably far away, pretty much every picture of it is going to be either an artist's impression or a nondescript spot of light. It's not like anyone's getting any good-quality close-up photographs of it any time soon. ] &#124; ] 23:29, 28 March 2019 (UTC)
:Pictures of the people involved in the history of understanding Rigel. Technical pictures of various spectroscopic things related to inferring properties of Rigel. Just a couple suggestions, ] (]) 23:45, 28 March 2019 (UTC)

{{clear}}
{{reftalk}}

===Remaining things...===
When I get some time, I'm planning on checking a few bits in the last two sections, which are still a bit messy. The stuff is obscure and not especially germane to the rest of the article. ] (] '''·''' ]) 20:04, 5 March 2019 (UTC)
:{{ping|Lithopsian|Praemonitus}} can you see anything else to do before a GA nom? ] (] '''·''' ]) 04:05, 21 March 2019 (UTC)

== Refimprove tag ==

I have removed the refimprove tag as about 98% of the article has inline citations. If this tag were relevant, probably 95% of[REDACTED] articles could be tagged in the same way.

{{ping|Arianewiki1}} I know you placed the tag originally related to Kaler and the hypothesis about the Bayer Designation. If you have an idea of a specific earlier source then tell me. I can't find Webb nor know who he is. Similarly with other questions of magnitude etc. I am happy to write something just not sure what. ] (] '''·''' ]) 04:32, 8 February 2019 (UTC)\
:This article is a mess, with many cites being misused or biassed to meet unfounded interpretation. Thomas Webb 'Celestial Objects' is a common source. Either get consensus or leave the template. ] (]) 07:45, 9 February 2019 (UTC)
::{{ping|Arianewiki1}} Webb does mention anything about Bayer in his book. He does note that Betelgeuse was brighter than Rigel in some observations by Herschel but that's it. So that leaves us with Kaler as the person who linked the brightness with the Bayer desginations and neither of the sources you. ] (] '''·''' ]) 13:34, 9 February 2019 (UTC)

:These reasons are no excuse to remove tags, especially as there is no consensus. Having cites here are not the problem, it is the selected cites require additional verification because they are not necessarily reflect facts nor basic knowledge about Rigel. e.g. Looks like biassed selection. If this article is going to get GA status this must be fixed. To fix it requires other independent editors to check. As for Webb, I claimed no such thing. Bayer is irrelevant. Herschel discovered Betelgeuse was variable , commenting that it was sometimes brighter than Rigel. Kaler's comment is certainly not his 'discovery'. I did not add the tag because of Kaler, it is because of the issues with whole article not just a singular issue.
:Again. Do not remove this tag again until these conditions are satisfied. Please read ], ] and the ] adopted here. As said: "Similarly, editors occasionally remove tags without solving real problems because they are abashed by the tag, do not want additional attention from other editors, or do not like tags." This applies directly here IMO. Note: I have also restored the removed dubious article tag. ] (]) 23:40, 10 February 2019 (UTC)

::{{ping|Arianewiki1}} "consensus" doesn't mean whatever you think. Now you're changing your story about Herschel, Webb and Kaler. Okay, that is settled. List ''specific'' faults instead of just some global statement. I asked you to explain the magnitudes above and you didn't, which suggests you are just tagging because you have an axe to grind rather than wanting to improve the article. If you ''explain'' issues then we can act on them, otherwise I can't assume you're acting in good faith. ] (] '''·''' ]) 01:29, 11 February 2019 (UTC)

:::Using tactics like this is unacceptable behaviour. I have little choice but to use the policies of ]. ] (]) 03:41, 11 February 2019 (UTC)

::You could start with the apparent magnitude issue - I don't follow how Hauck measured it and how it was better than what is in the article now. ] (] '''·''' ])

:::Who cares. There is a problem with the stated magnitudes, and it is clear it needs to be fixed if the article is ever to achieve GA. ] (]) 03:47, 11 February 2019 (UTC)

: Per ], "This template should be used only for articles where there are ''some'', but insufficient, inline citations to support the material currently in the article". This article clearly does not satisfy the criteria. Use common sense and apply inline citations to the specific issues. Repeatedly posting the same template is ]. ] (]) 14:11, 13 February 2019 (UTC)

== Distance and radial velocity question ==

Given that the star has a (positive) radial velocity away from the Sun and is stated to be considerably closer than the Orion Nebula by the article, how then does "projecting Rigel's path through space for its expected age brings it close to the nebula"? ] (]) 22:00, 13 February 2019 (UTC)
: I checked the source and it does not in fact agree with the statement in the article. I've tagged it with 'dubious'. ] (]) 15:50, 14 February 2019 (UTC)
::The Orion nebula is of course moving (or the sun is, depend on your point of view), but not in a radically different way to Rigel. I agree that the source doesn't support what the article says about Rigel, although it does leave the door open on Betelgeuse. I'll change it. ] (]) 17:09, 14 February 2019 (UTC)

== Rigel A? ==

There's a reason none of the references given for this article use the term Rigel A (some journal papers do use the term Rigel A when explicitly referring to the separate components, but this is very much a minority usage). Several reasons, even. Consistency is good, but using the term ''Rigel A'' consistently throughout the article simply makes it more wordy, and in most cases more confusing for the lay reader who doesn't much care about anything other than the blue supergiant. Oh, and ''Rigel A'' is also wrong, if we want to be strict about it. Even ''Rigel B'' is dodgy. ''Rigel'' is the blue supergiant, and nothing else. The IAU has even formalised that. Component designations are used with those designators that encompass the various components: Rigel does not; β Orionis arguably does; WDS J05145-0812 definitely does, although interestingly it isn't in the starbox. Using the term ''Rigel A'' (or B) might be justified in isolated cases where we need to be explicit about distinguishing components, but where we also want to use the Misplaced Pages article title, but we shouldn't use it "consistently" because we'd be imposing our own interpretation of ] on the world. ] (]) 19:51, 5 March 2019 (UTC)
:I'd agree with that -it's how all stars that are part of binary systems are called. The IAU has muffed that slightly but maybe it actually clarified it a bit. ] (] '''·''' ]) 20:02, 5 March 2019 (UTC)
:: Then the article needs to make clear what is being discussed, because right now it's downright ambiguous. ] (]) 00:20, 6 March 2019 (UTC)
:Again. Notorious ] looks like they are just making things up when they actually don't understand. Anyone who challenge them has the attitude of just ignoring. Saying : "Component designations are used with those designators that encompass the various components: Rigel does not; "The IAU has even formalised that. " Eh? It is plaining referring to the double star component. Any intelligent person would realise that the distinction is due to the star being a spectroscopic binary, SB9 307. Determination of spectral type and stellar parameters depends on separation of the spectral lines, hence the Rigel A and Rigel B for components.
:The only thing that is right is this statement: "…because we'd be imposing our own interpretation of ] on the world." Pot . Kettle. Black. Either understand conventions or leave editing to others. ] seems the only one here with objectivity seeing this. I'm sick to death of educating those who pretend to be "experts". Really, ]!!] (]) 04:48, 6 March 2019 (UTC)
:: No, for me it's just a matter of internal consistency within the article. I'm fine with what appears to be the preferred approach of applying the name Rigel to the primary. As long as it is consistent for the readers. ] (]) 15:31, 6 March 2019 (UTC)
::: So the question is now whether Rigel B etc. are all strictly Beta Orionis B etc. Be good to find a source discussing the names before this (using Rigel A), which has now been superceded...] (] '''·''' ]) 19:07, 6 March 2019 (UTC)

{{ping|Praemonitus}}Look. If you are referring to double star components, the convention is simply the discoverer abbreviation, catalogue number, then the component relationships. e.g. For Rigel it is STF 668A,BC, or BU 555AD, BU 555BC. Astrometric or unresolved components are Aa or Bb, etc. Double stars are measured between components, and this becomes complicated in multiple systems. Measures of distance or position angle for AB, AC, BC are explicit. Referring to components is STF 668A or BU 555D, but for the bright stars with Greek letters, β Ori A or β Ori D is used. There are other variants. You can look at WDS Notes section under : 05145-0812 STF 668 (note the uncertainties with some of these Rigel components.)

References of use also depend on the convention of how the object is observed. e.g. Spectroscopic observations use something like β Ori A or Rigel A. Radio or X-ray observation would use Rigel A.
As astronomers have much interest is supermassive bright stars like Rigel, it makes sense to implicitly refer to Rigel A, and not the multiple system per se. ] (]) 22:16, 6 March 2019 (UTC)

== Stellar system section ==

Does the section ] need to be moved so that it comes before discussion of the properties of individual components of the system? The multiplicity is mentioned in the lead, but the body discusses the components before it defines what they are. ] (]) 15:00, 6 March 2019 (UTC)
: I prefer presenting the astrometric information first, then move inward to the local characteristics. Hence, if it were up to me, I would have it ordered as follows: Observation, Distance (plus kinematics), 'Stellar system', 'Physical characteristics' (including Spectroscopy, Variability, and Mass Loss), then 'Etymology and cultural significance' and 'In modern culture'. ] (]) 15:46, 6 March 2019 (UTC)
:Fixed. Clear understand double star nomenclature is needed, which seems poorly misunderstood by editors here. IAU Commission 26 is the guide here. ] (]) 07:42, 7 March 2019 (UTC)
::That's fine and thanks for clearing it up, just make sure you right in grammatical English. Also, need a ref for Burnham. ] (] '''·''' ]) 12:04, 7 March 2019 (UTC)
:::I did that, but ] reverted my edit while I was still fixing the inconsistencies. I actual lost the following edit that was to come. Burnham needs no edit, as BU is the abbreviation for him, with the WDS giving the date of the first measure. ] (]) 21:19, 7 March 2019 (UTC)
:::: I'm not a mind-reader. The {{tl|in use}} template is available for when you're making numerous edits and don't want to be disrupted. ] (]) 22:32, 7 March 2019 (UTC)
:::::No accusation here. I was only pointing out the confusion with correcting the grammar (and trying to restore lost cites and text). I don't know about this template, so thanks for that. ] (]) 22:52, 7 March 2019 (UTC)

I've just made a second reedit of this section, fixing and reverting some of the continuing misunderstanding of conventions wrongly adopted by ]. The link to the WDS is to the Notes & Catalog, listed here. (Notable too the ADS designation is mostly irrelevant.) I have expertise in this area (published author), and suggest you discuss this on the talk page if you are uncertain or have questions. ] (]) 23:10, 7 March 2019 (UTC)
:Then don't write rubbish sentences like, " Rigel is observed as a ] comprising possibly up to five or six components." . Does the WDS catalog explicitly mention Burnham? ] (] '''·''' ]) 23:17, 7 March 2019 (UTC)
::The statement is plainly fact. Read the WDS catalogue. The WDS Notes also cast doubt on the existence of some of these components. The link to Burnham can be found in the "Introduction" and "References and discoverer codes" Bu (or β ) Burnham. A multiple star is simply three or more stars in a system. (See WMC on the same linked page.) The catalogue gives:
<pre>05145-0812STF 668A,BC 1781 2017 122 202 204 6.5 9.4 0.3 6.8 B8Iae:
05145-0812BU 555AD 1878 2017 7 2 1 44.5 44.5 0.3 15.4 B8Iae:
05145-0812BU 555BC 1878 2005 25 55 30 0.3 0.1 7.5 7.6 B9</pre>
::donating it is a multiple stars, the WDS Notes explain the possible additional components. BU=Burnham, 1878 is 'first date'
::It is clear that the mind set is wrong here. Double stars are related by two stars, but the obsession is titled too much to each single component. It is the relationship in multiple stars between the double AB or A,BC or BC, etc are specific to avoid confusion e.g. distance or position angle or even determining gravitational attachment. If you are discussion the stellar characteristics of the star use the specific name. I.e. STF 668A.] (]) 00:20, 8 March 2019 (UTC)
::If you want to claim this is all "rubbish" please know it is important to really get the facts straight first. Read ] again if you must. ] (]) 00:20, 8 March 2019 (UTC)
:::Just write more clearly then. ] (] '''·''' ]) 01:05, 8 March 2019 (UTC)
:::Misplaced Pages is about knowledge, and those editing should have at least a gist of the subject matter. ] has presented an made several dozen wrong statements and edits, where the more that is said the further away the article is from achieving GA status. I have presented many times where some of the problems that exist only to have this individual cause as much grief and disruption as possible. They continue to present an 'alternative' interpretative views of many astronomical subjects, and frankly, show a complete lack of wisdom. When confronted with the facts and is shown to be wrong, this individual chooses to act like a victim and now thinks it OK to ignore me when they are caught out . Yet again, why should I have to educate individual's edits, get them persistently reverted. e.g. ] reverted the discovery of STF668 by Herschel without any justification. Other state by them "Component designations are used with those designators that encompass the various components: Rigel does not; "The IAU has even formalised that." I obviously shown this to be utterly false. Even after explaining it in detail (as above), the revision comments shown in these edits Is this evidence of either incompetence or deliberate disruptive editing? Frankly cleaning up the mess and also writing more clearly is a task for the brave. If you don't know about something, then just get out of the way from others that do. ] (]) 08:07, 8 March 2019 (UTC)
::::If you actually stuck to facts instead of padding your actual information with verbose patronising fluff then people might actually listen more. According to the WDS, it's not STF 668AB either but 668A,BC - so STF 668 for the system is more accurate than STF AB. Furthermore,[REDACTED] tries to avoid words like "current" and Rigel B seems to be being dropped due to the IAU (though clearly has been used up till the IAU proper name push). ] (] '''·''' ]) 18:44, 8 March 2019 (UTC)
::::::Actually, STF 668AB is correct, which is how the visual double is generally viewed, with the other components being visually unresolved. <b>A multiple star is actually a number of double stars</b>, and it is normal to express measures (Position angle and separation) as the primary star /component relationship. It is implicit. Hence, doubles making the multiple system of Rigel (five components) are STF 668AB, BU 555AC, BU 555AD, BU 555Ba, BU 55Bb. (Yet even pair BU 555 BC can be considered as correct.) STF 668A,BC is presented because the historical measures (used to find any motion over time) might be mixed between STF 668AB and BU 555AC, hence the comma.
::::::As for "Rigel B seems to be being dropped due to the IAU…." On what evidence!! Please cite it. It is likely a fiction likely created by ] as a mere wrong opinion. (They don't know, and that was my whole point above.) Rigel B has been used in some of the literature, so even if it were dropped, it has been known as that. As I've previously said, the named is from the spectroscopic observations, whose components are revealed by multiple spectral line for each components. It has nothing to do with the IAU proper name push, it is just a adopted naming convention
::::::BTW, there are possibly <b>six</b> components for Rigel, being the possible spectroscopic companion close to the primary (Aa). The article states: "spectroscopic companion to Rigel has been reported on the basis of radial velocity variations, and even an orbit calculated, but it is thought that the star may not exist and the pulsations are intrinsic to Rigel itself." This appear in the text, yet editors repeatably remove "five or six components." ] (]) 22:52, 8 March 2019 (UTC)

::::: There are almost zero instances of books, web pages, or scholarly articles calling the secondary 'STF 688B' or 'STF688B'. Hence it doesn't deserve much attention herein. Misplaced Pages isn't for promoting alternative names. ] (]) 22:26, 8 March 2019 (UTC)

::::::Eh? The Starbox under "Details" give stars as 'A', 'Ba' 'Bb' 'C'. Referring to double stars STF 688AB are stars STF 688A and STF 688B. It is implicit, and indicates each visual component seen in the telescope even though is an unresolved triple with other sub-components. e.g. STF 688AB=STF 688A and STF 688B, STF 688B= BU 555B and BU 555C. BU 555B=BU 555Ba and BU 555Bb. This is how the WDS Notes are divided, as STF 688 in the first column, then the notes body referring to individual stars A or B, etc. In fully this is STF 688A.
::::::This is far from promoting alternative star names. The problem of naming components of multiple stars have been an issue for several decades and has been discussed in detail to standardise conventions, and has as yet not been fully resolved. (I.e. exoplanets is a further complication.)
::::::Plainly, STF 688AB refers to the double star system, while STF 688A or STF 688B refers to individual stars. 23:42, 8 March 2019 (UTC)
:::::::I have reverted ] last aggressive edit on this issue as I feel there is a misunderstanding between defining double stars and individual stars, which is made more complex with multiple stars like Rigel. There is no ultimate standard convention used in double star astronomy in this instance, and having published material on this subject, I feel I have the necessary expertise to show the convention is explicit. In the telescope, the only component visible is the 'B' star. Using other observational methods, this is further divided into additional components, but how do you differentiate these components? Obviously, components can be viewed as a multiple star system (WMC scheme), a series of double stars (WDS scheme) or individual stars. Depending on the observational method and the astronomical discipline have differences in nomenclature. Differentiating in the case of Rigel is more complex compared to most stellar systems. As far as I'm concerned, the more implicit STF 688B, for instance, cannot be mistaken talking about the visible companion of Rigel. Using STF 688AB (or just STF 688) cannot be confused when referring to the visual double star.
:::::::In the end, disagree, fine, but it is probably better to get consensus. Really. The distinction of usage if overly picky as it cannot be misconstrued in its meaning. ] (]) 00:34, 9 March 2019 (UTC)
:::::::::we can't deviate from the source. So either STF 668 or STF 668A,BC for the system. ] (] '''·''' ]) 02:29, 9 March 2019 (UTC)
::::::::::I've explained the reasoning, which you refused to listen too or just want too ignore. Reading Question 17 in the WDS Page it implicitly says:
:::::::::::"When a component designation is given the relative position is of the secondary relative to the primary. For example, for an AB pair at 180 degrees and 3", in a polar coordinate system the A component is at the origin and the B component is at a position angle of 180 degrees (due south) at a separation of 3". Pairs such as AC or BC are measured in a similar manner. ...By default a simple binary is listed without components; the primary is understood to be A and the secondary to be B." However, due to the stars being in a multiple system this needs to be implicit. As said in WMC: "the need for a simple, unambiguous, flexible, and computer friendly designation scheme for components of binary and multiple star systems,"
::::::::::STF 688AB is an acceptable designation and does not defy any double star or WDS convention. STF 688AB cannot be confused when referring to the visual double star. ] (]) 05:46, 9 March 2019 (UTC)

::::::: You appear to have misunderstood, so let me explain it more clearly then. The original statement was, "The secondary star is often referred to as Rigel B, β Ori B or STF 688B". From this the reader is led to deduce that the star is ''often'' referred to as "STF 688B". This is demonstrably not the case, since there are almost no readily available sources that do so. Ergo, I removed "STF 688B" from the sentence since it is plainly wrong. In fact, 'STF 688B' is a very obscure identifier that adds nothing for the reader, as is 'BU 555B'. These should be removed. ] (]) 19:30, 9 March 2019 (UTC)

:::::::: {{ping|Praemonitus}} Way to easy. Go to SIMBAD Use the identifier "**STF 668B" What do you get? Even the WDS says: "...By default a simple binary is listed without components; the primary is understood to be A and the secondary to be B." Methinks this isn't a a very obscure identifier and is NOT "plainly wrong." BU 668B is implicit for a double/multiple component. ] (]) 23:30, 9 March 2019 (UTC)

::::::::: {{ping|Arianewiki1}} SIMBAD is a database of accumulated information about the star, including identifiers. The presence of an identifier on SIMBAD says nothing of importance about the identifier, other than it exists. Nor does the identifier appearing in WDS make it particularly notable, other than to identify the discoverer. Instead you need to look at a range of sources and see how often it occurs. There is very little evidence of its notability in search engines, and we aren't here to promote obscure trivia on nomenclature. Plainly it doesn't belong except on a catalogue list, and if it is included then so must every other obscure identifier. There's a reason why ] exists. ] (]) 23:44, 9 March 2019 (UTC)

:::::::::: {{ping|Praemonitus}} OK. See paper "The High Angular Resolution Multiplicity of Massive Stars" Table 3 pg. 38 If experts like Mason and Hartkopf, who maintain the WDS and are on the IAU Commission 26, don't know then who does? If we talk about double or multiple stars, then the importance of the designation is paramount. STF 688B specifically identifies the visual component of Rigel seen in the telescope, but we know that the B star is composed of three stars not just one, which cannot be resolved. Your weakening argument above is mostly just clutching at straws, and trying to marginalise evidentiary facts for the sake of not being proven wrong. I have published material using this nomenclature and can claim am an expert on the subject, yet sheer novices, who know no better, think they can randomly tell others what identifiers are acceptable or not!
:::::::::: I have not "promoted" anything here (and saying so defies ]), and it is not trivial on nomenclature. As for saying "...if it is included then so must every other obscure identifier" is laughable. In this instance, there are no other possibilities than Rigel B, &beta; Ori B or STF 688B!!!! ] (]) 01:03, 10 March 2019 (UTC)
::::::::::: That paper doesn't contain Rigel in it, and just lists a whole bunch of alternate names. So what? AND what they use in the text is (surprise surprise) Bayer Designations or Henry Draper catalogue unless there is a specific reason not to. Also, after the way you often snipe at people, calling out someone on ] looks grossly hypocritical to say the least. ] (] '''·''' ]) 02:14, 10 March 2019 (UTC)
:::::::::::: A pretty weak response. ] is talking about convention of nomenclature not Rigel per se. They said "This is demonstrably not the case, since there are almost no readily available sources that do so. " I've provided and demonstrated an example the convention. (you think that over +120,000 systems, the usage might be "often" enough) As for the pointed out table is divided by designation e.g. 'Cluster, Other Designation' & 'V*, **, Other Designation' The second column is relevant double/multiple stars the second column has Bayer Designation or Henry Draper catalogue for individual stars. You could of had a point, but as you've said 'surprise, surprise', this B Star has neither! (Due to the saturation of the Plate towards Rigel, which blotted out this companion.) Again. <b>The whole Section is about the double star/multiple star components. </b> One would think it would be sensible to adopt the conventions used for double stars or multiple stars, even when showing evidence via SIMBAD, the IAU Convention that underlies it, the WDS, authors of a paper who maintain the WDS and are on Commission 26 of the IAU, and me who has used the convention. Plainly, the SIMBAD webpage for STF688B is a good enough cite and a reliable source.
:::::::::::: If such overwhelming evidence… well, at least there are other processes to use. Thanks for your input and contributions. ] (]) 22:55, 10 March 2019 (UTC)
::::::::::::: I'm done with this article. There's too much disruptive behavior going on. ] (]) 15:06, 12 March 2019 (UTC)
:::::::::::::: I fully understand....] (] '''·''' ]) 20:01, 12 March 2019 (UTC)
:::::::::::::::Nope. So far no on has bothered with presenting an opposite support against my given cites. "Disruptive behaviour" means that this is deliberate tactic to interrupt the editing process. So far, no one has rationally followed the logic of the argument, and so far, especially ], has not only has proven wrong opinion, yet has already engaged in disruptive behaviour. As for ] saying: "There's too much disruptive behavior going on". Prove it with real evidence, or just shut up. Really. ] (]) 07:46, 14 March 2019 (UTC)
:::::::::::::::::O-kay, let's see what {{ping|Ritchie333|Nick-D}} might think. Hi folks ''(waves)'' we're getting tired of slow reverts ( (i.e. look at the tag and the proportion of text actually referenced), and confrontational comments. We're getting a bit worn out by the ad hominem comments. Scroll up this page. I'll add diffs later. Gotta run. ] (] '''·''' ]) 11:11, 14 March 2019 (UTC)
::::::::::::::::::{{ping|Casliber}} I have no opinion on the content; I don't understand what the issue is with citing ] since I thought that was an authoritative database with responsible fact checking, but this is not my area of expertise. As far as I'm aware, Ariane is still on a 1RR restriction, and if she is gaming it to get her own way with tags by reverting just outside the 24 hour window, then that's problematic. ] ] ] 11:23, 14 March 2019 (UTC)
:::::::::::::::::::Referring to SIMBAD is not a problem. Arianewiki1 is obscure technical names that are not widely used. We're not saying they aren't invalid, just not common and so should not be replacing "β Orionis B" or "β Orionis C" in the body of the text. However elsewhere, umm...he with something that he later reverts. It just gratuitous negative comments like and . Plus he's been targeting Lithopsian. It's late here and I need to do some RL chores now before bed. Will try to clarify arguments tomorrow. ] (] '''·''' ]) 12:42, 14 March 2019 (UTC)
::::::::::::::::::::The problem isn't the reverts, and I feel if there are other games going on, now seemingly three editors trying to trip me up and have me blocked again. I have presented in good faith valid cites and sources, and everytime, there is another weak excuse. ] gives the definition and in double star astronomy it is also used. I have even published material using this format. I've asked for supporting cites using "Beta Ori D" or β Ori D" or "Rigel D", but none have been presented. e.g. As I said above: "As for "Rigel B seems to be being dropped due to the IAU…." On what evidence!! Please cite it" (] actually uses "Bet Ori".)
::::::::::::::::::::What is worst is complaining about some alleged ad hominem comments but it is perfectly OK for you to do so. e.g. "verbose patronising fluff" or "Then don't write rubbish sentences like,…." Yet when I say "If such overwhelming evidence… well, at least there are other processes to use. Thanks for your input and contributions." ] and ] uses the parting shot/excuse "There's too much disruptive behaviour going on". (I could use RfC or ask for independent opinion, etc. to get some resolution by consensus.) Here I was closing the debate, and have made no further edits with the main article. So where is this evidence of disruptive behaviour then?
::::::::::::::::::::As for accusation against ]. Well they think it perfectly OK to declare it is ignore me The claim of disruptive editing made by them is here If any editor is unwilling to engage in obtaining consensus means that any revert if they disagree is probably justified. This edit was justified, especially when they deleted the comment: "clarify |date=March 2019 |reason=The notation in the parentheses needs clarification for the reader.", which we were already properly discussing (and still discussing) within this same Talkpage here. Is this not even further evidence of disruptive editing by the same User? Yet in the same breath it is now claimed somehow I am "promoting obscure technical names that are not widely used.", when the evidence in this discussion says otherwise. Facts ultimately matter. In light of my own expertise in the subject, you are now basically insinuating that I'm lying.
::::::::::::::::::::Finally. It is pretty awful when someone tries to selectively push some argument of my alleged "gratuitous negative comments" like , but seemingly that I struck-out and withdrew the alleged offending text when your complaint was lodged. The second example is really weak and trivial. I've only attacked the ideas not the person, and corrected it if I did. Frankly, none of this holds water. ] are different from robust debate. If you still are unhappy, then continue this further with a ], not here please. ] (]) 05:54, 15 March 2019 (UTC)



Of course, we could used both designations, but that is also probably unacceptable. ] initial said in this thread: "As the body discusses the components before it defines what they are." The designations are still not defined not agreed too. ] (]) 06:15, 15 March 2019 (UTC)

:This source does not say this. "component C (β Ori C)." : "Addressing confusion in double star nomenclature: The Washington Multiplicity Catalog . See instead (2000) & Transactions of the International Astronomical Union (1948) pg. 386-387. ] (]) 06:14, 23 March 2019 (UTC)
::The source focusses on what suffixes to use, obviously. That is its main thrust. ] (] '''·''' ]) 08:16, 23 March 2019 (UTC)
:::Utter garbage. Source does not say this at all. "β Ori C" is not stated at all, but the usage is instead BU 555C. (This is again properly explained here.) I've previously explained (above) that the name is not used this way, but it that is unacceptable! Either exactly quote the confirming fact in the document or this reference must be removed. ] (]) 22:52, 23 March 2019 (UTC)

::::Implicitly, the source "New IAU Concepts of binary/Multiple Star Designations" by Dickel and Malkov says: : "Due to historical reasons… Typically the resolved double star system receives a designation consisting of an acronym (based on the discovers' initials) and a number. The components are labeled A and B. If B is found later to be double, the primary retains the letter B and the secondary becomes "b" although some observers adopt Ba and Bb. If B's binary nature is discovered by a different investigator, the system receives a new designation and a number in addition to the component labels. The spectroscopic binary tend to be designated by their HD numbers and the individual components by A and B." This definition is black and white, without any interpretation. So far Cas Liber continues to avoid gaining consensus and ignores plain evidence or logical deduction is light of the facts presented. On the presented evidence, they are plainly biassed and unhelpful, and are unable to provide any valid cite for "β Ori C."

::::{{ping|Ritchie333|Nick-D}} NOTE: I have reasonably now provided sufficient evidence and four citable sources confirming nomenclature in this example. They continue to make obstructive edits with deliberate blocking tactics knowing full well of current restrictions on Arianewiki1 (not helped by Ritchie333 'outing' Arianewiki1 restriction above.) Any further changes, without either consensus or evidentiary citations, should be deemed as ], which is sanctionable and could include things like a ].
::::Other examples of this personal bias/attitude are : ] and ] (which this is used to justify a revert, when the text is this talkpage section says otherwise. Worst is initial statement by Cas Liber ,"So, are we saying that as stars move off the main sequence into giant phase, have they exhausted their core hydrogen or almost exhausted their core hydrogen....?" yet they don't even realise Rigel is not a main sequence star! However. they still feel they are competent to revert edits even after it is explained to them on the talkpage! Again, further evidence of deliberate bias and disruptive editing. ] (]) 01:17, 24 March 2019 (UTC)
:::::When I said I have always used light-years, it is because that's what popular sources have used such , , among other. Hence when astronomers write for laypeople, they use light-years. ] (] '''·''' ]) 01:34, 24 March 2019 (UTC)

:::::Ok - reading though, yes I can see now where the IAU has designated the WDS names, but then goes on to call Rigel BCD "useful but unofficial" hence they are anointing the name as popular. ] (] '''·''' ]) 02:45, 24 March 2019 (UTC)

::::::Please stop editing the main page until you can get consensus and understand formal usage. Also stop ramming through changes before even discussing it within the article's talkpage, because every time you do, someone else has to fix the mess you leave behind. The recent edits here are unacceptable mostly because the sources don't say this at all or are being manipulated to fit some cherry-picked notions that are not commonly used e.g. selected bias. Worse is that the article is about Rigel A, where the companion stars are discussed in the sub-section, and should be using the "official" and recognised system adopted within the WDS. These designation should be discussed there not in nomenclature. Also changing all the text from β Ori B to Rigel B, for example, has been done without consensus. Lithopsian was the one who added this, which was a justified compromise. 'Rigel A' and 'Rigel B' in my opinion has been used by several sources, but 'Rigel C' and 'Rigel D' are not common at all. (Do you realise Rigel B refers to a combined three separate stars, while the <u>VISUAL</u> double star designations for each component. e.g. BU 555Ba, BU555Bb, BC 555C? (Here Rigel B=BU 555Ba+Bb+C) The reference I gave you above in "New IAU Concepts of binary/Multiple Star Designations" and WG Star name document says "For example, the name Fomalhaut specifically refers to the bright A component of a 3-star system." It does not say implicitly this applies to the other component stars. Fomalhaut C is not used, for example.
::::::As for the crazy explanation above makes little sense. "...IAU has designated the WDS names" Says who? This only applies to the Catalogue of Star Names, but "In the IAU CSN, the components are clearly identified via their WDS identifiers" meaning "Typically the resolved double star system receives a designation consisting of an acronym (based on the discovers' initials) and a number. The components are labeled A and B." As for "...but then goes on to call Rigel BCD "useful but unofficial"". The sources makes no reference to Rigel BCD (whatever that is) at all. The source makes no claim that it is "useful but unofficial" but only uses the word "unofficial" and are "informal names." Either way, these are not IAU recognised and are not always used in the WDS. As for "...hence they are anointing the name as popular. " is nonsense. That is YOUR own twisted opinion not the IAU's. ] (]) 00:15, 25 March 2019 (UTC)
:::::::That is why I noted the BU and STF notations in the nomenclature. Which you undid. For no reason except that you regard "consensus" as anything that you agree with, even if no-one else does. ''No-one'' else thinks the Burnham and Struve numbers should be littered through the text, becuase they ''aren't used''. ] (] '''·''' ]) 04:43, 25 March 2019 (UTC)

:::::::At the bottom of page 5 of it says, † "As these useful nicknames with the form often appear in the literature, many appear in the SIMBAD database."
:::::::here are two sources that use Rigel B,C and D. The reason Rigel C and D are rarely seen is that they are rarely discussed or studied ] (] '''·''' ]) 04:50, 25 March 2019 (UTC)
:::::::The section you cite Lithopsian is using "β Ori BCD" vs "Beta Orionis BCD" - not either vs Rigel BCD - and even then, you're not happy with anything with C or D anyway, so not much of a compromise ] (] '''·''' ]) 04:53, 25 March 2019 (UTC)
::::::::{{ping|Casliber|Lithopsian|Ritchie333}}"….you're not happy with anything with C or D anyway" is an absolute falsehood.
::::::::How many times do I have to say it? The component designation officially is BU 555C or BU 555D. Rigel C or D, Beta Orionis C or D are not legitimate, but Rigel A or B (Beta Orionis A or B or β Ori A, β Ori B) is legitimate. Why can't you simply understand that?
::::::::When referring as a double star, use BU 555BC or BU 555AD, but referring to the whole multiple system it is WDS 05145-0812.
::::::::Also just writing e,g. "component C (BU 555C)" should be good enough, but this was revert too. Isn't this evidence of a compromise? ] (]) 23:04, 26 March 2019 (UTC)
:::::::::If you made your points clearly and succinctly, and write what ''is'' acceptable rather than what is ''not'' acceptable, then this would all work a lot easier. Congrats for actually posting something succinct just now, for bonus points you could actually put it near the RfC tag below so that it is easier for someone to see all opinions all in one place. ] (] '''·''' ]) 00:45, 27 March 2019 (UTC)

== Constellation abbreviations ==

The article is somewhat inconsistent in its usage of β Orionis vs β Ori (partly because I just added a bunch of β Orionis!). I would tend to use β Ori if it was just down to me, but usage in other star articles tends to stick to the full constellation names more often than not. Do we want to use the abbreviation consistently throughout, after appropriate introduction of the full name obviously? ] (]) 15:06, 6 March 2019 (UTC)
:Even more nonsense. Use β Orionis first and once, then use β Ori thereafter. The obvious reason to do so is to make better readability. <strike>As for playing victim politics, it just makes you look weak</strike> ] (]) 21:33, 6 March 2019 (UTC)
:: Please try to keep this discussion ]. Thank you. ] (]) 22:19, 6 March 2019 (UTC)
: I'm not particular really. It's more of a style issue. As long as the reader can follow the naming conventions and it's consistent across the article. ] (]) 22:19, 6 March 2019 (UTC)

== Physical properties ==

Probably worth putting in (in as plain English as possible) how the different values for luminosity in the ''Physical characteristics'' were calculated, otherwise that section looks a bit odd with some wildly varying figures. ] (] '''·''' ]) 19:39, 20 March 2019 (UTC)
:I've added more explanations of how each value was derived. ] (]) 20:20, 20 March 2019 (UTC)
::Great - I think it helps demistify the section for the lay reader. ] (] '''·''' ]) 21:56, 20 March 2019 (UTC)
:::The section has now been rearranged largely into paragraphs dealing with each property one by one. It is certainly one way to go, but I think the information about how the various different values were derived has been lost. I can hardly read through the grammatical mistakes, maybe someone else can take a look and see if it is an improvement. ] (]) 17:04, 22 March 2019 (UTC)

== Confusing assertion in Observation section ==

The article asserts that Rigel "is visible all around the world's oceans (the exception is the area within 8° of the North Pole)", for which Thomas Kerigan (1835) is cited. Relevant edit is here: . I wonder, however, if this limitation of 8° applies only at certain times of the year (differs over the course of a year) and, furthermore, the cited source is pretty difficult to interpret on this issue. Can this issue be clarified? Thanks, ] (]) 13:48, 21 March 2019 (UTC)
:Good point - the source does not discuss its importance or where it is visible from. It just talks of calculations. Need to find another source and change sentence accordingly. It is 1am here and I need to get up in 5 hours. I'd be tempted to remove the sentence if nothing turns up. Will look more tomorrow if no-one else does overnight. ] (] '''·''' ]) 14:06, 21 March 2019 (UTC)
::I added the citation , more as general support for the paragraph than any specifics about the problem claim. It was the best I could come up with. Lots of descriptions of the use of Rigel for navigation, very few explanations of "why". ] (]) 21:00, 21 March 2019 (UTC)

== Exhausted H in core vs Almost exhausted H in core ==

So, are we saying that as stars move off the main sequence into giant phase, have they exhausted their core hydrogen or ''almost'' exhausted their core hydrogen....? ] (] '''·''' ]) 07:19, 22 March 2019 (UTC)
:With this edit: it is now said, in the lede, that Rigel has "started to exhaust" its hydrogen, but in the section on Physical Characteristics, it is said that the hydrogen is "almost exhausted". This will sound inconsistent to some readers, and it needs to be fixed. ] (]) 11:34, 22 March 2019 (UTC)
::changed to "depleted" and "largely exhausted" so they don't contradict each other. ] (] '''·''' ]) 14:38, 22 March 2019 (UTC)
:::The hydrogen fraction in the core is effectively zero by the end of the main sequence. Rigel is well past the main sequence. There is no "started to exhaust" or "almost exhausted", the hydrogen is gone from the core. The word exhausted is usually used, perhaps because it allows for the odd hydrogen nucleus still floating about in there unable to find a partner. Rigel is currently fusing hydrogen in a shell, possibly with some helium burning in the core, references available if we want to get specific. We probably don't because the models are uncertain and contradictory except for the basics. ] (]) 16:41, 22 March 2019 (UTC)
::::Do folks feel happy about this now for GAN? ] (] '''·''' ]) 20:29, 22 March 2019 (UTC)

:::::"Rigel is well past the main sequence." is not quite true. A main sequence star is defined as luminosity class 'V' not 'Ib' as for Rigel. It is positioned near the main sequence on the H-R Diagram, but Rigel is not a main sequence star. High mass stars evolve almost immediately from the top left towards the top right of the HR Diagram, whose direction changes several times before going supernova. If the hydrogen were fully exhausted in a star it is likely to be a red giant not a blue star. Lithopasian is right in saying it is fusing hydrogen in the core is in a shell, but the energies being produced is mostly by other nucleosynthesis processes in the core (mostly helium burning. Hydrogen, however, is still being burnt, but the shell is slowly narrowing. The source of hydrogen is available by convection from the bulk of the star. When fuels are finally exhausted, the core collapses, creating the supernova. ] (]) 22:25, 22 March 2019 (UTC)

::::::Unbelievable garbage, just plain wrong. You really need to consider your position wrt ] and stop disrupting everything that is written by almost every other editor. I have no doubt you will take that as a personal attack, but it needs to be said. ] (]) 14:56, 25 March 2019 (UTC)

:::::::I thought you were ignoring me… However, I'll take these provocative and emotive comments with a grain of salt, because they will damage to you far more than they damage me. It is yet another example of trying to deflecting criticism just to hide one's own lack of wisdom or knowledge. Attempting 'accusing the accuser' is weak and boorish behaviour, made worst without even presenting actual evidence.

:::::::#If you think Rigel is/was a main sequence star, then you certainly shouldn't be editing this article.
:::::::#Plainly (from your own words) If Rigel is burning hydrogen in a shell in the core it can't also have exhausted all the hydrogen. Surely an open contradiction.
:::::::#Direction changes across the HR Diagram (called blue loops) and recent research shows is enhanced by mass loss. (See "Physics of the blue-to-red and red-to-blue transitions in the evolution of massive stars - I. From blue to red" by Claudio Ritossa for the general concept actually works. Many other sources discuss this.
:::::::#James Kaler also says: "Only about 10 million years old, Rigel should eventually expand to become a red supergiant very much like Betelgeuse is today, by which time it will be fusing helium into carbon and beyond in preparation for its eventual explosion as a supernova. (Given the various observational and theoretical uncertainties, it is also possible that the star has a somewhat lower mass of say 14 solar or so and that it is now fusing its helium after already having BEEN a red giant that shrank some and heated at its surface to return to blue supergianthood)"
:::::::As for this section, much of this whole section is just openly rewording James Kaler ] (]) 01:47, 26 March 2019 (UTC)
::::::::Lithopsian obviously ''doesn't'' think that and I am puzzled as to how you come to that conclusion. The shell and the core are generally held to be in different parts of the star. If Kaler is summarising then obviously the overall content is going to resemble it. There is no similarity of wording however. ] (] '''·''' ]) 10:15, 26 March 2019 (UTC)
:::::::::"The shell and the core are generally held to be in different parts of the star." Nope. ] : "A stellar core is the extremely hot, dense region at the center of a star. For an ordinary main sequence star, the core region is the volume where <b>the temperature and pressure conditions allow for energy production through thermonuclear fusion</b> of hydrogen into helium." Stellar cores can have structure depending on the age and mass of the star. Above any stellar core is the radiative zone. Dystopian astronomy at its worse.] (]) 22:19, 26 March 2019 (UTC)
::::::::::{{ping|Arianwiki1}} then why do sources talk of core burning and shell burning hydrogen? It's late and I will have a read and think on this ] (] '''·''' ]) 14:50, 18 April 2019 (UTC)

:Clarification. In deference to ] sledges, you misunderstand the early stellar evolution of supergiant stars. The problem is the main sequence stars are dwarf stars (luminosity class V) are they reside on this line for 90% of their lives. However, supergiants do not do this because of the rate they consume their fuel. They do not reside or live on the main sequence but rapidly cross it, and the very moment they meet it, the star is still shrouded in its bearing nebulosity. A helium core develops and the hydrogen is depleted but NOT ended. This is why the H-R Diagram in the very top left does not show a continuous line but a vacant gap between the luminosity classes. Looking at Ryan "Stellar Evolution and Nucleosynthesis" (now in the article) pg. 91 has a figure showing a supergiant crossing the main sequence line.
:The failure is the precision of the language used and gives an ambiguous contradiction in the meaning of the main sequence itself. e.g They don't move off the main sequence nor end of the main sequence, they move straight through the main sequence. My apologies, I should have been clearer in my statements. ] (]) 00:58, 18 April 2019 (UTC)
::{{ping|Arianwiki1}} okay I get that point. Again I will have a read of the book...but we still have articles on things like ]s. I mean, yes they only spend a very short time on it...but then again their whole life is short...? ] (] '''·''' ]) 14:50, 18 April 2019 (UTC)
:::Seriously? After endless bouts of over-tagging, stealth reverts, walls of words, abuse, and threats to individuals, we finally get an explanation and it is this fantasy? Massive stars have perfectly normal, if short, main sequence lives and they are visible with class O spectra and main sequence luminosity classes. At around the mass of Rigel, they are late class O stars and the main sequence lasts 5-10 million years. See ] for an example. The whole of the post-main sequence life for a star such as Rigel is under a million years. See for a fairly readable overview (many other undergraduate course notes are available to read online), or for a more detailed explanation that should be understandable without too much prior expertise. For a reasonably recent journal paper discussing stellar evolution at solar metallicity, see , and for one concentrating on massive stars, . If you're still the slightest bit unsure, I suggest asking someone independent with some background in astrophysics to come and debunk this so we can finally move on with the article. ] (]) 19:26, 18 April 2019 (UTC)

::::{{ping|Lithopsian}} {{ping|Ritchie333}} In saying: "Seriously? After endless bouts of over-tagging, stealth reverts, walls of words, abuse, and threats to individuals, we finally get an explanation and it is this fantasy?" ] to get a point across is unacceptable behaviour here, and in expressing: "...abuse, and threats to individuals", are very serious accusations. Saying so with any actual proof is straying into the area of another ]. (Justification from my submission here being somehow "a threat" is simply implausible. e.g. Pointing out actual editing policies cannot be construed as a threat.) By using further abuse to subdue an alleged abuser is the very definition of bulling, and it leads to questions of your own motives as to why. This here is another example.What is more revealing is these recent edits here just BEFORE your response above. Is this now your pertinent example of some "stealth reverts" or perhaps someone wanting the ire of some admin to permanently end my editing here? (I've pinged an admin here just in case.) I've act in ], and nearly every change has corresponded to an appropriate explanation (right on wrong) on each talkpage.
::::Yet, I do appreciate your response and cites above, I've read them, though it doesn't change my views or knowledge. The central problem with all massive stars is they "lose very large amounts of mass, enabling some of them to evolve back to the blue part of the HR diagram" Table 2 and is a very good illustration. The article says Rigel's mass is now about 21±3 solar masses. If so, the initial mass must have been about 35 to 40 solar masses pre-main sequence - lasting according to this Table 2 - about 3 million years. If 24±8 is true this is even shorter. For Rigel, saying "...the main sequence lasts 5-10 million years" isn't quite ringing true. Furthermore, in saying: "The whole of the post-main sequence life for a star such as Rigel is under a million years.", if it were a more massive 30-40 solar masses it would be even shorter than this. Our astrophysical understanding at this is speculative at best.
::::Your example of 10 Lac is an interesting case, but its theoretical 26.9 solar masses will be 8.7 solar masses at the end of the hydrogen burning. (Again using Table 2.) Right?
::::In the Rigel article, I added under 'Physical characteristics': "<i>Estimation of many physical characteristics of Rigel and other blue supergiant stars are difficult due to their rarity and uncertainty about how far they are from the Sun. As such, much of our understanding about their characteristics is based on theoretical stellar evolution models.</i>" I find it perplexing that the H-R Diagram in the Rigel article implies the larger massed stars appear in the upper left of the figure, but under the ], this same area finds all the luminosity classes (between absolute magnitudes −10 to −3 and between the O and B spectral classes) don't join together. Why is that? If you look at 10 Lac again, the article says the absolute magnitude is −4.4, which is where the Main Sequence line appears to end as shown in the ] article. Between O9V or O9I, is there a difference? So a difficult question then: When Rigel was on the main sequence, was it luminosity class I, class V or something else?
::::Also under 'Formation', this same article says (another slight contradiction) "O class and early B class stars with initial masses around 10-300 M☉ evolve away from the main sequence in just a few million years." & "Blue supergiants are newly evolved from the main sequence, have extremely high luminosities, high mass loss rates, and are generally unstable." (If so, what were they when they were ON the main sequence?)
:::: If you want to debunk something make sure not to just gloss over the facts. Again. There is: "...ambiguous contradiction in the meaning of the main sequence itself." Definition says the Main Sequence is where hydrogen to helium burning ends in the core, but it is also defined as a specific type of luminosity class of star that is based where it lies on the H-R Diagram. This is the "ambiguous contradiction." ] (]) 02:47, 19 April 2019 (UTC)

==Parsecs come before light years==
Parsecs are used before light years. The sources of distance in the references given state parsecs. (Except Burnham's) Usage is based on the measure of parallaxes of stars that are converted directly to parsecs. (Calculated as the inverse of parallax) It is also the IAU explicit definition and is an SI unit of measure. Convention is parsec (pc.) for stars, kiloparsecs (kpc.) for anagalactic objects and megaparsecs (Mpc.) for extragalactic galaxies. While expressing light years might make sense for novice readers, the usage should be parsec with light-years in brackets. ] (]) 23:01, 22 March 2019 (UTC)
:In case you hadn't noticed, we are writing for laypeople. Light-years is what is used in guidebooks etc. ] (] '''·''' ]) 23:57, 22 March 2019 (UTC)

:Astronomical articles should be standard WRT units used. I've always used light-years. However, feel free to open an RfC on the issue on the astronomy wikiproject page. If the consensus is to use parsecs overall, I will abide by that ] (] '''·''' ]) 23:59, 22 March 2019 (UTC)
::"I've always used light-years." Explains a lot. Sources in the article trump anything else. All but one source uses parsecs. RfC or your opinion is irrelevant. ] (]) 06:41, 23 March 2019 (UTC)
:::Open a guidebook. Sources are just measurements. If we had one using feet and inches we wouldn't be using them, would we. ] (] '''·''' ]) 08:02, 23 March 2019 (UTC)

== RFC: What we call Rigel's companion stars (part I) ==


Rigel has five stars requiring us to call them something in this article. They had been called Rigel A, Ba, Bb, C and D. However the IAU has ruled that the name "Rigel" applies to the main star, leaving some confusion as to the rest. SIMBAD lists as 'Beta Orionis B' . At least two sources use Rigel B,C and D. . The IAU at the bottom of page 5 says "As these useful nicknames with the form often appear in the literature, many appear in the SIMBAD database." but notes they are unofficial. Other names - STF 688B for Rigel B, and BU 555Ba, BU555Bb, BC 555C and BU 555 D for Rigel Ba, Bb, C and D respectively - are almost never used, and only rarely seen in journals. So we have a choice - Rigel A, Ba, Bb, C and D....Beta Orionis Ba, Bb, C and D...or...what? Can people denote their choices below. ] (] '''·''' ]) 05:09, 25 March 2019 (UTC)

*Me, I'd go with Rigel, and Rigel Ba, Bb, C and D (for A, Ba, Bb, C and D) as the most understandable and ones that are alreaady used in guidebooks. I am okay with Beta Orionis Ba, Bb, C and D and happy to change back (just I found sources using the former). Can everyone put down what they think and why below. ] (] '''·''' ]) 05:09, 25 March 2019 (UTC)
*I'd prefer &beta; Orionis Ba, Bb, C and D. The IAU, for I assume good reasons, has designated star names to apply to only one component, so for consistency I'd prefer to use the Bayer designations for the components. I have a recollection of having argued the other side of this in another article and eventually accepting the Bayer position. ] (]) 05:49, 25 March 2019 (UTC)
*I'm not comfortable with ''Rigel B'', ''Rigel C'', etc. I've used them in the past, but their borderline status has been completely stamped on by the IAU. Using them now just risks confusion with ''Rigel'' officially only applying to component A, even to component Aa if it turned out to be a spectroscopic binary. This has been discussed to death elsewhere in Misplaced Pages and elsewhere; I think it was a poor decision but it has been made. ''Rigel B'' in particular was widely used, almost as a proper name, but using that for one component and not for the others would be even more confusing. The components should really be referred to wrt a multiple star designation, but I can see that the multitude of different designations, all of them somewhat unfamiliar alphanumeric codes, could be off-putting and confusing. That leaves β Orionis, or Latinised, or abbreviated, as an accessible but unambiguous compromise. It isn't a formal multiple star designation and it was never conceived as a designation for several stars, but equally it is not considered to apply only to a single component of a system. ] (]) 14:40, 25 March 2019 (UTC)
::Beyond the collective designation for the stars is the designation for individual components. For example, the "star" discovered and named as ''Rigel B'' is (assuming the current accepted triple system) really component BC, β Orionis BC if you like. β Orionis B strictly only refers to the brighter of the close visual pair, so we need to be clear when we're referring to individual components. Again there is scope for confusion historically since ''Rigel B'' (or other designation for component B) was used for the unresolved pair (triple). Less trouble with spectroscopic pairs since β Orionis B includes both β Orionis Ba and β Orionis Bb. ] (]) 14:49, 25 March 2019 (UTC)
*I concur with Tarl N and would prefer β/Beta ..., as stated above. Thanks <span style="text-shadow:grey 0.5em 0.5em 0.6em;">''']''' (])</span> 17:31, 27 March 2019 (UTC)

*Although I agree that the RFC is poorly constructed, it seems to me that most of the associated walls of text are irrelevant. The article is about Rigel. The associated stars are relevant in several respects and deserve either full mention, or thorough linking to separate articles on all the specimens of major interest, whenever a separate article is the preferred option. At the least, if they are to be fully discussed in this article,then there should be redirections to this article under all the relevant names. Should such names be invalid, but in common, even minority, use, then as any decent encyclopaedia should, we should make them helpfully accessible (typically as redirections) and clarify their status wherever the user may find the relevant material without special searching.<br>Now then, assuming that the alternative names be discussed (and where better than in this article?) it all seems simple to me (famous last wo...). In the main text use the formally correct names, even if they are cumbersome (or if they really, really are too unusable, the most popular alternatives), but in either case be carefully consistent throughout the article. To avoid confusion, mention in the lede that there is a range of alternatives, and refer (or even link) the reader to the section on nomenclature. In the section on nomenclature discuss the details, technical, historical and all that a reasonable reader should reasonably want to know in this article's context. Add a proper link to an article on stellar nomenclature. Note that this option is future-proof; If we change our minds in future, only the chosen main name need be changed. ] (]) 06:59, 7 April 2019 (UTC)
{{Expert needed}} This is a poorly constructed RfC that clearly fails even the basic guidelines on ], especially ] and the initial statement is a long way from neutral POV.
There are questions here.
#The nomenclature for the primary star. Rigel A, Beta Ori A or β Orionis A
#The nomenclature for the visual double star companion. Rigel B, Beta Ori B or β Orionis B
#The double/multiple star designations used by the IAU towards named IAU I<i>single stars</i>
#The double/multiple star designations used by the WDS & IAU Commission 26 'Double stars" and traditionally adopted, as stated by the source "New IAU Concepts of binary/Multiple Star Designations" by Dickel and Malkov:

The last point is explained as: "Due to historical reasons… Typically the resolved double star system receives a designation consisting of an acronym (based on the discovers' initials) and a number. The components are labeled A and B. If B is found later to be double, the primary retains the letter B and the secondary becomes "b" although some observers adopt Ba and Bb. If B's binary nature is discovered by a different investigator, the system receives a new designation and a number in addition to the component labels. The spectroscopic binary tend to be designated by their HD numbers and the individual components by A and B." This definition is the 'official' one.
I've called in expert help to is resolve this RfC which is deliberately biassed to enforce a viewpoint. ] (]) 08:12, 26 March 2019 (UTC)
::That's an assumption of bad faith (not surprising) and you can't just answer the question but (again) have to go on a spray complaining and exaggerating. Are you actually able to succinctly state what terms you'd use for what? ] (] '''·''' ]) 10:11, 26 March 2019 (UTC)
:::The RfC actually says "Other names - STF 688B for Rigel B, and BU 555Ba, BU555Bb, BC 555C and BU 555 D for Rigel Ba, Bb, C and D respectively - are almost never used, and only rarely seen in journals." is openly discounting the usage even though it IS the official recognised method of designation!! It's 'rarity' in usage is irrelevant.
:::My four points above are the possibilities of usage, but according to the RfC the "So we have a choice - Rigel A, Ba, Bb, C and D....Beta Orionis Ba, Bb, C and D...or...what?."
::Usage depends on the type of object that is being described.
::*If it is a <b>main star</b>, then Rigel A or β Ori A is acceptable.
::*If you are talking just about the <b>main visual double star companion</b>, then Rigel B or β Ori B is acceptable
::*If you are talking about the <b>multiple star</b>, it is WDS 05145-0812 is acceptable
::*If you are talking about the <i>individual</i> <b>stellar components</b> (in the section 'Stellar system') then STF 688A, BU 555Ba, BU 555Bb, BC 555C and BU 555D is acceptable.
::*If you are talking about the <i>individual</i> <b>double stars</b> (in the section 'Stellar system') then STF 688AB or just STF 688, BU 555Ba,Bb, BC 555AC and BU 555AD: or even BU 555BC is acceptable.
::*<b>Outside</b> the section 'Stellar system' use either Rigel A or β Ori A and Rigel B or β Ori B OR write "component 'C'", 'D'. etc.
::*<b>Inside</b> the section 'Stellar system' use either STF 688A, BU 555Ba, BU 555Bb, BC 555C and BU 555D OR write "component 'C'", 'D'. etc OR OR write "component 'C' (BU 555C)", 'D'. etc. Once stated, then use "component C"
::Frankly, it is impossible to reduce complex nomenclatures across multiple disciplines. Simple usage of Rigel A or β Ori A for the <b>main star</b> that is mostly highlighted in the article, when once said, means Rigel. Simple usage of the double/ multiple star designation are used once e.g. Rigel C (BU 555C)", the referred as variations of "companion C" or "component C", etc.
:::Note: The usage is similar to other articles
:::*] , but all the double/multiple star designations are missing. (the article uses Castor A but the starbox uses Castor A and α Gem Aa)
:::*Yet for ] is also inconsistent there are no double star designations nor explanation. Another is ] which has a hybrid version of this.
:::* ] says "Under the rules for naming objects in multiple star systems, the three components – Fomalhaut, TW Piscis Austrini and LP 876-10 – are designated A, B and C, respectively. On its discovery, the planet was designated Fomalhaut b." Fomalhaut C, under its subsection mentions it is WSI 138.
:::*] uses Mu Orionis Aa, etc. but ignores the double star designations of A 2715A & A 2715B.
:::*Usage for ] or Mizar has other inconsistencies too, which Lithopsian says " According to IAU rules, the name Mizar strictly only applies to component Aa, although it is traditionally and popularly used for all four stars making up the single naked-eye star." (The IAU rules actually apply to the A star not Aa system.)
:::Again there is complete ignoring the designation system for double/multiple stars or have inconsistent usage.
:::My points made above for general usage would likely eliminate some the overall troubles. ] (]) 01:27, 27 March 2019 (UTC)
{{outdent}}
] - the question was for this article. While a discussion on a general policy is probably a good idea, it should go on a project page, not here. ] (]) 01:51, 27 March 2019 (UTC)

{{ping|Arianewiki1}} if the IAU has determined that "Rigel" only relates to Rigel A, that then means that Rigel A is no longer official...? ] (] '''·''' ]) 05:12, 27 March 2019 (UTC)

:To be pedantic (and avoid recursion), IAU has determined that Rigel applies to only &beta; Ori A.<ref>{{cite web |title=Naming stars |url=https://www.iau.org/public/themes/naming_stars/ |website=IAU |accessdate=27 March 2019}}</ref> ] (]) 06:12, 27 March 2019 (UTC)
{{reftalk}}
{{ping|Mike Peel|Modest Genius|AhmadLX}} - all input would be good here. ] (] '''·''' ]) 10:04, 27 March 2019 (UTC)

:::::Yet further faux pas. ] in RfCs is not permitted here.] (]) 00:51, 28 March 2019 (UTC)
::::::Can you understand English? Can you see any part of edit where I promote or recommend these to these three (3) editors support a particular point of view? Please explain. I am all ears, or revert your ]. These editors are nonpartisan and would not hesitate to offer a different opinion to mine. ] (] '''·''' ]) 03:54, 28 March 2019 (UTC)
::::::::{{ping|Ritchie333|CasLiber}} "These editors are nonpartisan..." According to whom? ] says plainly "Canvassing is notification done with the intention of influencing the outcome of a discussion in a particular way, and is considered inappropriate. This is because it compromises the normal consensus decision-making process, and therefore is generally considered disruptive behavior." It is deemed as ] . So "If they continue, they may be reported to the administrators' noticeboard for incidents, which may result in their being blocked from editing." Remove the attach template again, and an ] will likely result. (I've pinged ] as a third person arbiter and will adhere to their advice.)
::::::::There are so many structural errors in the formulation of this RfC. It seems to be written to promote a singular viewpoint. When I give a reasonable response, but according the Cas Liber "Are you actually able to succinctly state what terms you'd use for what? " I give a more detailed explanation, I'm told by Tarn N "While a discussion on a general policy is probably a good idea, it should go on a project page, not here." You've been explained again and again of the complexity with these designations and the dependance on the disciplines, but you again insist (as stated in the RfC) "They had been called Rigel A, Ba, Bb, C and D.", when most sources and the advice above says no such thing. The IAU has <b>TWO</b> designations: Those recently added for IAU named <i>single</i> stars, the second is that assigned / supported by the IAU Commission 26 'Double stars'. Rigel A refers to the primary for the named star 'Rigel', but is also STF 688A using IAU Commission 26 conventions. Appropriate usage of both is reasonable. Surely the main article should reflect that fact?
::::::::The statement "No-one else thinks the Burnham and Struve numbers should be littered through the text, becuase they aren't used." immediately suggests deliberate selective bias, and why the whole framework of the RfC is to promote a singular irrelevant viewpoint.This is even worse the falsehood stated here., but is now seen as wrong here. Yet the RfC now says "Other above names - STF 688B for Rigel B, and BU 555Ba, BU555Bb, BC 555C and BU 555 D for Rigel Ba, Bb, C and D respectively - are almost never used, and only rarely seen in journals. So we have a choice - Rigel A, Ba, Bb, C and D....Beta Orionis Ba, Bb, C and D...or...what?" This is why I've said about this RfC above:"... the initial statement is a long way from neutral POV." Who actually says this? ] (]) 07:34, 28 March 2019 (UTC)
:::::::::Pointing out they are rarely used is merely pointing out facts. Go find some journals (meaning plural) that use the notations then. Just to show the rest of us how commonly they are used. ] (] '''·''' ]) 10:38, 28 March 2019 (UTC)
::::::::::Enough is enough. I'm done with being berated for what I write and seeing tactics that just aims to discredit. I've already before given four separate references (including SIMBAD) and have shown the usage, so your allegation stated above is obviously false.
::::::::::As for saying: "Pointing out they are rarely used is merely pointing out facts." Yet you earlier said: ""No-one else thinks the Burnham and Struve numbers should be littered through the text, becuase they aren't used." Which is it? (Have you ever considered the reasons that the C and D components are rarely used is only because they are rarely studied or observed? They are regularly observed for indication of motion, whose results are kept by the US Naval Observatory and given in the WDS. BU 555D has been observed 7 times, BU 555C 25 times. There a few external journals highlighting these stars as the brightness of Rigel itself makes further studies difficult. Quite a few of these measures are unpublished and just sent directly to the USNO. The B component has been measured 125 times as well.)
::::::::::When I do state as a reasonable suggestion "<b>Outside</b> the section 'Stellar system' use either Rigel A or β Ori A and Rigel B or β Ori B OR write "component 'C'", 'D'. etc." <b>Inside</b> the section 'Stellar system' use either STF 688A, BU 555Ba, BU 555Bb, BC 555C and BU 555D OR write "component 'C'", 'D'. etc OR write "component 'C' (BU 555C)", 'D'. etc. Once stated, then use "component C"
::::::::::Yet just going to SIMBAD and search for all objects around Rigel out to 5 arcmin, you only get three objects. bet Ori, STF 668 and Beta Ori B. Going to Beta Ori B. has identifiers SFT 668B, comprised of the double star BU 555BC. <b>THERE IS NO OTHER ALTERNATIVES FOR THESE DESIGNATIONS!</b> So the question for you. If Rigel A, etc. are the 'unofficial' IAU designations, then what are the 'official' IAU designations for the components then? 02:31, 29 March 2019 (UTC)

(Invited by the bot) The companion stars have no single names, so there is no "right" answer. So, inform the readers on the most common names that groups/ people have assigned to them. Then, if further coverage of them in this article is appropriate and you need a noun to refer to them by, use the longer scientific number as they are the most unambiguous and useful if you go elsewhere. <b style="color: #0000cc;">''North8000''</b> (]) 12:06, 16 April 2019 (UTC)

== "In modern culture" ==

The "In modern culture" section reads:

]
:''{{seealso|Rigel in fiction}}''
:''The ] was originally a Norwegian ship, built in Copenhagen in 1924. It was requisitioned by the Germans during the ] and sunk in 1944 while being used to transport prisoners of war.<ref name=minnehallen/> Two US Navy ships have borne the name ].''

:''The ] was a ] program for the ] that was cancelled in 1953 before reaching deployment.<ref>{{cite book | last=Yenne | first= Bill | year= 2018 | title=A Complete History of U.S. Cruise Missiles | location= Forest Lake, MN | publisher= Specialty Press| isbn=978-1-58007-256-4 | pages=61, 70}}</ref>''

:''The ] are a chain of small islands in ], renamed after originally being called Utskjera. They were given their current name as Rigel was used as an ].<ref name=skerries/> ], also in Antarctica, is also named the star.<ref name=mountrigel/>''

None of these are actually '''about''' Rigel. They're about other things that just happen to be named "Rigel". The section should be renamed, reorganized or moved to a disambiguation page. ] &#124; ] 10:39, 28 March 2019 (UTC)
::Err, they were all named after the star. I get your point though and am pondering. ] (] '''·''' ]) 10:59, 28 March 2019 (UTC)
:::Yes, they are all named after the star, but none of them '''are''' the star. Therefore this section is more like "Things named after Rigel in modern culture". ] &#124; ] 11:51, 28 March 2019 (UTC)
::::A section titled some variant of "Popular culture" is a common problem in Misplaced Pages. These sections are like kudzu, every time you try to trim them back, they get more entries added. The general (exhausted) attitude I've seen is to mostly ignore those sections. ] (]) 02:54, 29 March 2019 (UTC)
===References===
<references/>

==What we call Rigel's companion stars -II==

I have added this recent edit to the article page which compromises between adaptation of the non-stanadard names and the popular names and includes two adequate cites for both sources. (The article now splits this into two paragraphs.) The figure within this page from "New Concepts of Binary/Multiple Star Designation" here shows the unambiguous usage of the wider used system used for multiple and double stars.

I think the failure is the arguments previously to this has been argued using either "A or B" for designations (The premise of the RfC, where the argument should have been "A and/or B". I agree that using Rigel A (or its variants) should be widely used throughout the article if only because it makes the article easier to read. However, regardless of the rarity of usage, if both methods are still used, they must be therefore both credible in their usage.

If editors do still feel strong objections still, then the double star designations could be perhaps added as an additional endnote.

If an editor wants to delete this text again, before doing so, please answer: "If Rigel A, etc. are the 'unofficial' IAU designations, then what are the 'official' IAU designations for the components then?"

Note: My last response in the RfC here reasonably explains how much they are used. (as Cas Liber asked "Just to show the rest of us how commonly they are used.". I now have. ] (]) 02:28, 31 March 2019 (UTC)

:Okay, the official designation is Rigel for Rigel A and the other obscure names that you've listed. The nomenclature section now accurately lists the names except for some bit that I . The preference of other parties is to use Beta Orionis BCD (presumably) given Rigel's restriction to the most luminous component. I am happy with that. ] (] '''·''' ]) 11:48, 31 March 2019 (UTC)

::I have reversed your edit because Beta Orionis for the B, C and D stars are not mentioned in the reference, as already pointed out by others. The reference has to be in the paragraph, as the IAU decision is on single stars and not multiple.double stars. There is no references that I can find no official statement define that the case. B, C and D are defined by two sources that use it in the cites. i.e. Kaler. Also please strike out the word "obscure" above, and they are in fact the official nomenclature, as "New Concepts of Binary/Multiple Star Designation" shows. Also, your contributions were not the only compromises made here. ] (]) 23:20, 31 March 2019 (UTC)

:{{ping|Attic Salt}} I have just removed the unnecessary reference altogether, as it does not state this but the cite of Garfinkle and Kalrrigel does. This is still factual without it, and it removes any ambiguity or continuing debate. ] (]) 23:29, 31 March 2019 (UTC)

:::After reading these edits again, I have reconsidered this last edit. Casliber (incorrectly) wrote that the reference "refers to Rigel BCD not A" when the made an edit, but the source does refer to A. e.g. pg.5 "…it was decided to attribute proper names to individual stars rather than entire multiple systems. For example, the name Fomalhaut specifically refers to the bright A component of a 3-star system." The reference implies e.g. pg..5 "The informal names often attributed to other components in a <b>physical</b> multiple (e.g., “Fomalhaut B”) are treated as unofficial,…" so Rigel B can be correct but Rigel C and Rigel D cannot, because we do not know if they are physically attached to Rigel A. I interpret that the reference cite should be attached to Rigel B NOT Rigel C or D. Their statement is therefore not implicitly true.
:::Saying: "...preference of other parties is to use Beta Orionis BCD." had little to do with the IAU publications, which proceeds the publication date of the IAU decision.
:::Furthermore, this same reference says " In the IAU CSN, the components are clearly identified via their WDS identifiers…", which verifies the double/multiple star designations in this whole paragraph. Thanks for pointing out these finer points. ] (]) 01:44, 1 April 2019 (UTC)
::::Are you deliberately misreading ?? It says on page 5, "The informal names often attributed to other components in a physical multiple (e.g., “Fomalhaut B”) are treated as unofficial, and not included in the IAU Catalogue of Star Names†." with the footnote adding "As these useful nicknames with the form often appear in the literature, many appear in the SIMBAD database." - this clearly refers to any component of the Rigel system EXCEPT Rigel/Rigel A. Are you so set on your own opinion? How can you possibly read this any other way?? ] (] '''·''' ]) 10:33, 1 April 2019 (UTC)
:::::Look. The usage is for components that are <b>physically</b> attached in a multiple system. Rigel B seems certainly attached, but the C and D stars are yet to be verified. i.e. they could be optical doubles. (this has been pointed out in the RfC by others in the discussions above.) I don't think the text necessarily supports Rigel C and Rigel D at all, and I think you might be over reading this. Rigel C and Rigel D is hardly 'often' and the usage does not extend to SIMBAD. Also the statement "...the name Fomalhaut specifically refers to the bright A component" just verifies to name 'Formalhaut A' and 'Rigel A' and implies the name 'Formalhaut' or 'Rigel.' Either term is OK. Uncontroversial I'd think.
:::::Again. The IAU decision is on <u>single stars</u> and not <u>multiple/double stars</u>.
:::::Again. If Rigel A, etc. are the 'unofficial' IAU designations, then what are the 'official' IAU designations for the components then? ] (]) 23:15, 1 April 2019 (UTC)

:::Also I won't strike out "obscure" - many official names are obscure ''Canis lupus'' is obscure to may dog owners, "134340 Pluto" is obscure. So are all the WDS designations. Most journals use other designations. ] (] '''·''' ]) 10:38, 1 April 2019 (UTC) is
::::Continuing to state these are "obscure" is being done only for emotive reasons and is not based on fact. Either cite a source that says the WDS nomenclature are 'obscure' or stop saying it. As you cannot seem to answer the simple question: "If Rigel A, etc. are the 'unofficial' IAU designations, then what are the 'official' IAU designations for the components then?", your contentions cannot be taken seriously. ] (]) 23:25, 1 April 2019 (UTC)
:::::The IAU says the official name of Rigel A is Rigel. I don't know why you did as it is obviously talking about other components that are not the bright ones as the example is FOMALHAUT '''B'''. ] (] '''·''' ]) 10:06, 2 April 2019 (UTC)

:::::Also this is why the sentence uses the word ''such'' as I know the source is not referring specifically to Rigel BCD (or A for that matter) but '''all components where they are referred to by a common name followed by letter'''. ] (] '''·''' ]) 10:10, 2 April 2019 (UTC)
:::::::By for the designation to be valid, it has to be <b>physically</b> attached. Star C and D are not. As Lithopsian rightly says: "Using the term Rigel A (or B) might be justified in isolated cases where we need to be explicit about distinguishing components, but where we also want to use the Misplaced Pages article title…" & "I''m not comfortable with Rigel B, Rigel C, etc. I've used them in the past, but their borderline status has been completely stamped on by the IAU." & "β Orionis B strictly only refers to the brighter of the close visual pair, so we need to be clear when we're referring to individual components" (therefore discounting C, Ba and Bb), Hence the IAU single star source was never meant to be used to as you are suggesting. We've agreed that using these terms in the article is for simplicity but extending this to some IAU 'stamp of approval' is quite unjustified.
:::::::Also, do not again remove this tag until you have consensus to do so. "Your" view here doesn't override other's objections. Removing this tag does not allow other editors to know there might be a dispute with ] Also saying "remove incorrect tag (again) see talk" is unfair because this tag has been only added once. ] (]) 23:04, 2 April 2019 (UTC)
::::::::It is not just my view as OTHER SOURCES DO CALL THEM RIGEL C AND D. So it is your OR by selectively discounting the other sources. ] (] '''·''' ]) 23:25, 2 April 2019 (UTC)

:::::::::Ridiculous argument, as the article sentence "Rigel's companions for simplicity are abbreviated as Rigel B,, C, and D. " immediately before this gives two references for the usage (Garfinkle and Kalerrigel). (being cites .) The tag I've added ONLY applies to statement " The IAU describes such names as "useful nicknames" that are "unofficial"." It may apply to Rigel and and Rigel B, but as C and D components are not known as a <b>physical system</b>, the terms are not applicable. The IAU reference does not say what you allege. Removing the tag means this point cannot be investigated by other users in gaining consensus. You are dictating an opinion on a tag without any gained consensus. (Lithopsian in the quotes above seems to agree with my POV.)
:::::::::So far I have attempted to try and accommodate your POV, which the most relevant is this, which you reverted by removing my comment "(as used in this article)" which shows your allegation is quite false. Even this compromise associated with Rigel B and leaving the text you've removed.
:::::::::Yet the worst thing here is your continued refusal to answer this question (now five times) "If Rigel A, etc. are the 'unofficial' IAU designations, then what are the 'official' IAU designations for the components then?"
:::::::::Either replaced the tag or this issue will dramatically escalate. ] (]) 01:20, 3 April 2019 (UTC)
::::::::::The offical names are "Rigel" for the brightest component (as you well know). The source states: "In the IAU CSN, the components are clearly identified via their WDS identifiers" (as you well know). I have said this before, so don't lie or exaggerate by claiming you've asked repeatedly and not been answered. ] (] '''·''' ]) 02:37, 3 April 2019 (UTC)
:::::::::::Good. So much happier now. My simple search of this page finds I've asked this five times, without you directly answering it. It is a lie nor am Iexaggerating the problem. Crucially, I'd do now think that your <i>interpretation</i> then is that the WDS identifiers are then superior designation than the single IAU star designation? (Your 'obscure' designation now seems contradictory.) It is a pivotal distinction. It also infers that WDS designation should be used, but for simplicity of the article using Rigel A to D is a reasonable compromise. However, the IAU 'single star' article infers a physical association to qualify as these 'unofficial' designations, C and D don't count. This is the second contradiction.
:::::::::::Clearly the usage is confusing between the two IAU sources. (It isn't an issue between[REDACTED] editors, but the IAU itself.) At least this supports the text of the WDS designation and Lithopsian's recent revert discussed in the next thread. ] (]) 05:01, 3 April 2019 (UTC)

Okay, let's ask other people whether a "failed verification tag" is needed here...{{yo|Lithopsian|Attic Salt|Sbznpoe|AhmadLX|Tarl N.|Rursus}}. PS: This is just about the use in ''that sentence''. Happy to change all the rest of the article to Beta Orionis BCD etc. or whatever we decide after. ] (] '''·''' ]) 02:37, 3 April 2019 (UTC)
:This is in reference to {{tq|The IAU describes such names as "useful nicknames" that are "unofficial".{{failed verification|dated 2nd April 2019}}|q=y"}}? I don't know what's unverified about it, section 2.2 of the cited IAU WGSN reference describes them as unofficial and in a footnote further characterizes them as nicknames. Certainly at a first glance, the "not in citation given " seems unwarranted. As for potentially not being in the same physical system (visual binary only), that hasn't stopped past designations of associations. ] (]) 04:03, 3 April 2019 (UTC)
::I will comment - references earlier than about 2016 won't follow the IAUs current convention of the proper name applying only to the primary. Looking through my home library of astronomy books dating back to the 1970s, every single reference I could find to that white dwarf in orbit around Sirius, called it "Sirius B". And it was referenced as such in an Astrophysics course I took last year, where the professor was caught unawares that the IAU now considers the name to refer to only the primary. So we're on the bleeding edge of change where we might consider ] rather than official names. ] (]) 05:02, 3 April 2019 (UTC)

:I'm no friend of IAU who very often violate sound philosophical and linguistic, principles and cannot produce a sound definition of a planet. IAU erect principles for star naming, then accept random star names by an international contest, which violates tradition and how the older star names emerged. I get the impression that they believe they are in power, and can do anything they want. Like kings. Of their "guide lines", only the following is sound: ''"Names that preserve world heritage (astronomical heritage, cultural heritage, and natural heritage) are strongly encouraged. Common and cultural star names are to be preferred over new names to preserve continuity and recognize astronomical heritage."'' Their other "guide lines" are bunk, and if a star had a name in the past, it has the name now. Misplaced Pages does not have IAU guide lines as a rule, nor a guide line. If astronomers seldom use '''Helvetios''' for ], then the name is neither traditional, nor commonly used, it is just a immature whim.
:One of the most untraditional of the ideas conceived by IAU is that only the brightest star in the star system had a name. It is not only untraditional, it is very awkward. If Rigel B and C was used in the past, then Rigel B and C was used in the past. We do not abide by IAU:s rules, we abide with facts. ] dixit. (]!) 07:18, 3 April 2019 (UTC)
::I agree that decision will ultimately cause more problems than it solves. Still think it deserves mentioning, if we're going to mention the IAU naming decisions at all. Then we can ignore it, if that is what we think reflects the real world most accurately. ] (]) 16:45, 3 April 2019 (UTC)
:In reference to names like Star A, B or C, and the sentence in the article: "The IAU describes such names as "useful nicknames" that are "unofficial"." I confirm that the cited source for the IAU description does indeed describe such names as "useful nicknames" that are "unofficial". ] (]) 12:50, 3 April 2019 (UTC)
:I don't see any problem quoting what the source says, since it is a reliable source in this context. To be certain we're all discussing the same thing, the referenced document states at the bottom of page 5 "The informal names often attributed to other components in a physical multiple (e.g., “Fomalhaut B”) are treated as unofficial, and not included in the IAU Catalogue of Star Names†.". The dagger indicates a footnote that states "As these useful nicknames with the form often appear in the literature, many appear in the SIMBAD database." So it doesn't seem out of line to describe them as "useful nicknames" that are "unofficial" in the IAU's opinion. ] (]) 16:45, 3 April 2019 (UTC)
: <sup></sup> is certainly not true here. <span style="text-shadow:grey 0.5em 0.5em 0.6em;">''']'''-]</span> 19:28, 3 April 2019 (UTC)
:::{{ping|AhmadLX}} Appreciate the comment, however, the document is more explicit than that, It only applies to established physically attached components.
:::Again. The reference implies e.g. pg..5 "The informal names often attributed to other components in a <b><u>physical multiple</u></b> (e.g., “Fomalhaut B”) are treated as unofficial,…" so Rigel B can be correct but Rigel C and Rigel D cannot, because we do not know if they are physically attached to Rigel A. It is reasonable to interpret that the reference cite should be attached to Rigel B NOT Rigel C or D. What interests the IAU is to associate named bright stars with real system components, including exoplanets. .eg. A hypothetical Rigel b.] (]) 21:46, 3 April 2019 (UTC)
::::Again, they are not definitely not attached and you are deliberately ignoring that that is what they are (informally) called. ] (] '''·''' ]) 01:22, 4 April 2019 (UTC)
::::::Bingo!. ] "If a group of four or more stars are physically close and gravitationally bound, it is a physical multiple star and should be placed under the subcategory Multiple star systems." If "they are not definitely not attached" then they are not part of a "physical multiple." Ergo. The informal names often attributed to other components... are not treated as unofficial as they don't even exist under this IAU scheme of names of single stars. ] (]) 03:49, 4 April 2019 (UTC)
:::::::We have nothing in the article that says that C isn't a member, and D is equivocal. We go on sources and they are discussed as (definite/possible) members of the system. We need to add material from a reliable source that doubts C's membership of the system. But still, they are still popularly called (Rigel) C and D. You can't change that. ] (] '''·''' ]) 04:19, 4 April 2019 (UTC)
::::::::Correction. The source of ] "If a group of four or more stars are physically close and gravitationally bound, it is a physical multiple star and should be placed under the subcategory Multiple star systems." is here. (not written by me.)
:::::::::As for: "But still, they are still popularly called (Rigel) C and D. " No one denies that (I've said it several times), BUT, the cited IAU source doesn't verify that as fact. You've already got two cites that use such designation, and for the usage through out the article is accepted by me (and seemingly everyone else. From your previous statements the options for your arguments are rapidly narrowing. Now stating in desperation that "We have nothing in the article that says that C isn't a member, and D is equivocal." Yet another ill-informed diversion. OK. Prove that this is true. (Please know I'm an expert on this subject, published on the subject, ) Plainly the cited source does not say what you think, ] (]) 07:57, 4 April 2019 (UTC)
::::::::::We have nothing in the article that casts doubt on C's membership of the multiple system. I just tried looking on SIMBAD. If you know a paper on this, please add. ] (] '''·''' ]) 13:33, 4 April 2019 (UTC)
:::::::::::Simply, as previously stated, Rigel B usage means the three components Ba, Bb, C. The reason why these stars are combined is they are essentially unresolved by visual means. In SIMBAD, you can search for Rigel B, finding the combined star. Historical usage appears in reference Moravveji et al. (2012) "It is a member of a multiple star system where its companion, Rigel B, is a spectroscopic binary about 9.5′′distant)."
:::::::::::"Rigel C" does appear in SIMBAD, whose only usage seems to be in 1991 is the popular magazine 'Astronomy' - hardly a reliable source - and clearly not used by professional literature. I know of no other professional paper, whose only formal usage I know is BU 555 BC. Yet when searching in SIMBAD out to 4 arcmin finds three objects. Rigel BC is not used. Rigel D certainly doesn't apply.
:::::::::::As for: "We have nothing in the article that casts doubt on C's membership of the multiple system." It is part of a multiple system, but we don't know if it is a part of the physical multiple system.
:::::::::::I'd think, Rigel B has enough support to 'official' use, but the usage of the rest is dubious at best.
:::::::::::The article sentence of:
::::::::::::*"For simplicity, Rigel's companions can be designated as Rigel B,, C, and D; the IAU describes such names as "useful nicknames" that are "unofficial"." should be:
::::::::::::* "For simplicity, Rigel's companions can be unofficially designated as Rigel B, though Rigel C and Rigel D usage has not been commonly adopted or promoted."
:::::::::::A fair enough compromise. 23:29, 4 April 2019 (UTC)
::::::::::::Disagree. An orbital period has been predicted for Rigel BC for starters. Find another article that discounts that would be a good starting point. I recall the original Burnham article calls it BC. will look up the ref. ] (] '''·''' ]) 23:45, 4 April 2019 (UTC)
:::::::::::::Oh dear. Round and round in circles and now desperately clutching at straws. (Read the section below. 'Unhelpful edits on Rigel's Nomenclature' Irrelevant.') Rigel B comprises of Ba,Bb and Rigel C. Rigel B is already sufficient. Some predicted orbital period does not necessarily mean it is attached because the the motion has been only 25 degrees in PA and the separation has reduced by 0.2 arcsec. There is no evidence of orbital motion so it is an assumption. If an orbit had been calculated, then where is it? Again. Component C (BU 555BC) is part of a multiple system, but we don't know if it is a part of the physical multiple system. Saying there is a Rigel BC or Rigel C with IAU recognition is unsupported, while the official name for the system is BU 555BC, but using BC alone might be acceptable but Rigel BC is neither used nor remotely supported. Burnham says "The BC pair" and "Rigel C" isn't mentioned. (pg.1299-1301). Saying that "Often referred to as Rigel BC" just isn't true. (When I placed the official double star designation in brackets it was collectively removed by reverting!)
:::::::::::::As for "Find another article that discounts that would be a good starting point."I've already told you.: "I know of no other professional paper, whose only formal usage I know is BU 555 BC. " So sorry. No. You think it true then the onus of proof is yours not mine , as per ]. ] (]) 02:26, 5 April 2019 (UTC)
::::::::::::::Do you even read what you write? Obviously if an orbital period exists then someone somewhere has examined and calculated one. The burden needs to be on someone commenting that the star might not be a part of the system. ] (] '''·''' ]) 02:56, 5 April 2019 (UTC)
::::::::::::::I have. No orbit exists. A possible period can be estimated simply by estimating the distance and apparent separation. It has to be proven that the star have similar proper motions and lies at the same distance. An orbit has to have measures to draw out the orbit and calculate the orbital elements.The 6th Orbit catalogue, for example, does not have an orbit, and there are no sources that say this. None. ] (]) 04:08, 5 April 2019 (UTC)

This continued circular debate now has to end as we have reached the level of unproductive minutia. The quickest solution is logically to write the questioned article sentence from:
:*"For simplicity, Rigel's companions can be designated as Rigel B,, C, and D; the IAU describes such names as "useful nicknames" that are "unofficial"."
and changed to:
:*"For simplicity, Rigel's companions can be unofficially designated as Rigel B, though Rigel C and Rigel D usage has not been commonly adopted or promoted."
A fair enough compromise, eliminating interpretation of the IAU sources without arguing usage from references . ] (]) 02:42, 5 April 2019 (UTC)

==Unhelpful edits on Rigel's Nomenclature==

]The following recent edits by ] on the ] article are very unhelpful, to the extent that it almost crosses into vandalism and deliberate provocation. We have been actively engaged on the Rigel talkpage to gain reasonable consensus, which Lithopsian has seemingly just chosen to ignore.

The important point, which seems to have misunderstood, is that <b>a multiple star is comprised of several double stars</b>. (The double star designations enable the defined position angle and separation between any given measures made between two components. It is not an arbitrary distinction.) It is not simply, as said as the reason for this revision "please stop confusing WDS discoverer codes with general double star designations." It isn't. Evidence for the double star designations for Rigel appears in the WDS Catalogue, and is properly cited. e.g.

<pre>05145-0812STF 668A,BC 1781 2017 122 202 204 6.5 9.4 0.3 6.8 B8Iae:
05145-0812BU 555AD 1878 2017 7 2 1 44.5 44.5 0.3 15.4 B8Iae:
05145-0812BU 555BC 1878 2005 25 55 30 0.3 0.1 7.5 7.6 B9</pre>

#The multiple star designation is WDS 05145-0812, and is why they all have the same value.
#The individual double star designations are STF 668A,BC, BU 555AD, BU 555BC.
#The individual star designations are STF 688B for Rigel B, as BU 555Ba, BU555Bb, BC 555C and BU 555D for Rigel Ba, Bb, C and D respectively.

For simplicity, the names Rigel Ba, Bb, C and D (or variants) is used throughout the main article, with the broader consensus and cites supporting statements of the double star/ multiple star designation and usage.

(Even the Introduction acknowledges that "Rigel BC, it is actually a very close visual pair". It is the double star BU 555BC. That is the double star designation, or the older β 555 BC)

The important addition of Dickel (2000) reference is that it shows (in the figure) the designations of individual stars: thus supporting the individual star designations. It is still relevant. By removing this is ignoring both the gained compromise and consensus needed to show the actual usage of component designations. Furthermore, why even add the Argyle reference "A new classification scheme for double and multiple stars", which has nothing to do nor states anything relevant to double / multiple star designations as they are used here. It is hardly 'equivalent' and 'newer' hardly means better. The WMC method already is exactly the same as used in the WDS Catalogue exampled above.

Upon the above evidence, I have therefore justifiable reverted much of this modified text. I welcome any counterarguments within my expertise in this subject matter.

:Note 1: In case the reverter hasn't seen this, in the section above "What we call Rigel's companion stars -II" I've explicitly said: "I have added this recent edit to the article page which compromises between adaptation of the non-stanadard names and the popular names and includes two adequate cites for both sources. (The article now splits this into two paragraphs.) The figure within this page from "New Concepts of Binary/Multiple Star Designation" here shows the unambiguous usage of the wider used system used for multiple and double stars."

:Note 2: The Burnham double star β 555 was only changed in the WDS to BU 555 to the catalogue so it could be electronically distributed. ] (]) 02:43, 2 April 2019 (UTC)

===Third opinion===
An editor has requested a ] on this section, but as only one person has posted to this section, it is impossible to know what the point of disagreement is ''in this section''. The request adds, "Another similar disagreement problem is paralleled here under ]", but in that section there are more than two editors in the discussion, so again it is impossible to give a third opinion, which is designed for situations in which there are exactly two people in disagreement. I recommend you try some of the other ] options. ] (]) 15:39, 22 April 2019 (UTC)

== Rigel BC is used in the literature ==

I just want to point out that several publications concerned with double stars refer to "Rigel BC":

http://adsabs.harvard.edu/full/1947LicOB..19..175J
http://adsabs.harvard.edu/full/1948LicOB..20..115M
http://adsabs.harvard.edu/full/1954AJ.....59..388M
http://adsabs.harvard.edu/full/1941PUPFA...6b...1W

] (]) 03:38, 5 April 2019 (UTC)

: Umm… So what. These are being used in the measures, and usage define the visual pair. Considering between 1880 and 1930 there were many observations that stated they could not confirm the star was real. Having 4 sources saying Rigel BC and 21 measures using BU 555BC (There are 25 observations up to 2005.) can hardly makes this common usage. The table of measures in the WDS only uses BU 555BC.
:Still, pretty good work to find these in those sources! (I've fixed your reference above for clarity.) ] (]) 03:57, 12 April 2019 (UTC)
:: Umm ... you might be over-interpreting things. I was providing information for the discussion on what to call these stars. I don't have a strong opinion on the subject. ] (]) 12:55, 12 April 2019 (UTC)

==Third Introduction Paragraph==

] has modified the 3rd paragraph here of the Introduction from:.

{{quote|Rigel's brightest companion (Rigel B) is itself a likely triple star system whose centre is separated from Rigel by 9.5″. Rigel B and Rigel C components form a very close and equally bright visual pair that is only visible with moderate sized telescopes. Together they have a combined apparent magnitude of 6.7 or 400 times fainter than the supergiant primary star. Rigel B is itself a much closer spectroscopic binary composed of the components Ba and Bb, whose tight separation is less than 0.1″.}}
:to:
{{quote|Separated from Rigel by 9.5″, two companion stars, Rigel B and Rigel C, are very close to each other and approximately equal in brightness. They are a visual pair that can be resolved by a moderately sized telescope. Together they have a combined apparent magnitude of 6.7 or 400 times fainter than the supergiant primary star. Rigel B is itself a much closer spectroscopic binary, with components Ba and Bb that are separated by less than 1 mas."}}

They claim in their reasoning that "No, this was acceptable." Ignoring who actually says this, is is clear the context explained extensively within the Rigel talkpage that the ""Rigel's brightest companion (Rigel B) is itself a likely ] whose centre is separated from Rigel by {{val|9.5|ul="}}

Also in a previous edit, they had again removed "Rigel's brightest companion (Rigel B) is itself a likely ] whose centre is separated from Rigel by {{val|9.5|ul="}}", on the basis that "<i>This is not a good thesis sentence for this paragraph. Technical detail doesn't belong in thesis sentence, and possibly doesn't belong in the lede. Confusing assertion that Rigel B is "likely" a triple star, when body of article only says "might". Then rest of paragraph only discusses Ba and Bb. So remove.</i>" This complaint makes little sense. Again we do not know for certain these stars are attached, so writing in absolutes terms in not possible. Science is mostly about probabilities and evidence. e.g. Rigel Ba and Bb are a binary and physically attached. Star C is uncertain. Saying "likely" or "might" is better than saying something that is false.

There is significant difficult in writing this factually and concisely, and admittedly both versions do miss essential points.

The triple star ID is mostly based on the Washington Double Star identification, stating the pair is STF 668A,BC. As Rigel B is the unresolved spectroscopic binary (Stars Ba and Bb) with Rigel C comprise the triple star system, which may or may not be physically associated. The distance of 9.5 arcsec is presented in the WDS is written as A,BC because past measures of the pair cannot be distinguished between the B or C stars. It is better to say the distance is the midpoint of the three stars (Ba, Bb, C) I'd think.

Again after reading this, I have expanded and rewritten this Introductory 3rd paragraph. The important issue is the visual pair with Rigel B, which is visible in ordinary telescopes and is of most interest to the reader, but Rigel C and the spectroscopic binary components remain essentially unresolved. Although this latest version might be further condensed, the summary explains the stars' relationship between them. Grammar corrections might be necessary, but ] shouldn't be changing the context. ] (]) 03:37, 12 April 2019 (UTC)
:Hello Arianewiki1, my concern with the original paragraph (you've reproduced it yourself in your commentary) concerns what it says about Rigel B. The first sentence says that it is a "likely triple star system". But the last sentence says that it is a "spectroscopic binary". You might have some interpretation as to what all this means, but most readers would find this to be contradictory. ] (]) 13:16, 12 April 2019 (UTC)

:::Thanks for this response. The difficulty is that Rigel B in some sources is considered only as the visible single companion star (e,g.). (Lithopsian has stated this too.)
:::Meaning that :
:::*Rigel (or Rigel A) and Rigel B forms the visual pair (STF 668 AB) discussed in the initial statement (two lines). (9.5″ apart)
:::*Rigel B itself is another double star (BU 555 BC), whose primary is Rigel B with companion is Rigel C (or formally component BU 555C). (~ 0.1″ apart`)
:::*Primary star Rigel B is again double, but is the spectroscopic binary Rigel Ba, Bb, where Ba is the primary and Bb is the companion. (0.001″ apart.)
:::*Rigel C, Rigel Ba & Rigel Bb form a triple star, that together are the single unresolved Rigel B
:::*Rigel A (primary) & Rigel B (secondary) equals Rigel A (primary) & collectively Rigel Ba, Bb, C (a triple.)
:::Each star is shown in the Starbox and in the relationship figure of the arrangement in the Hierarchical scheme.
:::Re-reading the new text and have added further clarification

::{{quote|Rigel appears as a ] that can be resolved by small to moderate sized telescopes. The much fainter 6.7 ] companion, known as Rigel B, is separated from Rigel by {{val|9.5|ul="}}, but is often difficult to view as it is 400 times fainter than the primary star. Rigel B forms another very close double star (~{{val|0.2|ul="}}) with Rigel C, whose two components are approximately equal in brightness. Star Rigel B is again a much closer unresolved ] (Rigel Ba and Rigel Bb) that are separated by less than {{val|1|ul=mas}}. These three stars together may form a physical triple star whose centre of mass is orbiting its bright supergiant primary."}}

:::Before again changing this paragraph in the article, how can the context be further improved?

:::NOTE: Writing this paragraph, the assumed compromised constraint using the component nomenclature: Rigel (meaning primary Rigel A), Rigel B, Rigel Ba, Rigel Bb & Rigel C. ] (]) 02:34, 13 April 2019 (UTC)
::::As a lede paragraph, it needs to be consistent with the content of the body of the article. When I modified the paragraph, I was using the figure in the section "Stellar system" as a guide. One difficulty I find with your writing is the use of the word "form", which (to me) introduces ambiguity. So, for example, here: you refer to "These stars" (meaning Rigel Ba and Bb) "forming" a physical triple star orbiting its bright supergiant primary. Very confusing, as it sounds like you are saying that two stars (Ba and Bb) are a triple. I believe that the average Wikireader would be confused by such a description. Please consider proofreading what you write and try to write more clearly. And you can stop trying to discourage me from editing ("Before again changing" and abundant examples on my talk page written by you). ] (]) 13:58, 13 April 2019 (UTC)

:::::Your behaviour shown here is simply appalling, especially towards trying to deescalating the dispute. That you even consider that the disputed text reflects the section 'Stellar system' shows you've misunderstood it and the context. The paragraph your pushing is factually wrong. Two main points then:

:::::#"Separated from Rigel by 9.5″, two companion stars, Rigel B and Rigel C, are very close to each other and approximately equal in brightness." Here 'Rigel B' is the visual component to the bright star (Rigel A), which is: "They are a visual pair that can be resolved by a moderately sized telescope <b>NOT the stars Rigel B and C stars</b>. The Rigel B and C stars are mostly not seen any telescopes because they are too close together to resolve. <b>The statement is factually wrong.</b>
:::::# "Together they have a combined apparent magnitude of 6.7 or 400 times fainter than the supergiant primary star." The stars Ba, Bb and C have a combined magnitude of 6.7 NOT just Rigel B and C. <b>The statement is factually wrong.</b>
:::::My text: "Rigel appears as a ] that can be resolved by small to moderate sized telescopes. The much fainter 6.7 ] companion, known as Rigel B, is separated from Rigel by {{val|9.5|ul="}}, but is often difficult to view as it is 400 times fainter than the primary star." This is 100% correct because this is how it appears in the telescope. I've seen it myself.

:::::The clear proof that Attic Salt is misunderstanding the text is saying that: "These stars" (meaning Rigel Ba and Bb) "forming" a physical triple star orbiting its bright supergiant primary."

:::::No. It means <b>Rigel Ba, Bb AND Rigel C</b> are make the triple star. (Sure the word 'forming' might be changed to something else. e,g. creating, making, constituting, etc., but it is hardy ambiguous.) Also a 'physical triple star' is also different from a 'triple star', as one is known to be These stars together may form a physical triple star orbiting its bright supergiant primary. attached the other meaning three star close together in the sky.) Disagreement between the words 'likely' and ''

:::::But if you did think "These stars together may form a physical triple star orbiting its bright supergiant primary.", then instead of just reverting everything, it would be better to change the text to : "These stars (Rigel Ba, Bb and C) together may form a physical triple star orbiting its bright supergiant primary." Alternatively, tag the questioned part of the text or seek clarification on the talkpage as being discussed here.

:::::Again. Do you even realise Rigel B divides as two stars, being Rigel Ba and Rigel Bb (<i>spectroscopic binary star</i>) <b>OR</b> Rigel B can be described Rigel B and Rigel C (<i>a double star</i>) <b>OR</b> Rigel B can be described as Rigel Ba, Rigel Bb and Rigel C (<i>triple star</i>) <b>BUT ALSO</b> through most telescopes Rigel B only appears as a <i>single star</i>?

:::::This is what needs to be conveyed. (I've openly said this is hard to convey in a paragraph.)

:::::Yet you've now come back now claiming "And you can stop trying to discourage me from editing ("Before again changing" and abundant examples on my talk page written by you.)"

:::::The opposite is actually true. If you can improve of my latest version, go for it. I've openly requested "Before again changing this paragraph in the article, how can the context be further improved?" and "Grammar corrections might be necessary, but Attic Salt shouldn't be changing the context."

:::::So instead of working together to improve the context (or readability) and get some consensus, you've again revert the text back to a version that is not factually and proven as wrong. I thought is better to write out the context in full then work through the problems, but as usual, you create some pretext of 'ambiguity' or that '... the average Wikireader would be confused by such a description". That is just an opinion, which seemingly already based on wrong preconceptions and assumptions Attic salt has made. The utter audacity to say: "As a lede paragraph, it needs to be consistent with the content of the body of the article." when I was the editor who updated most of the section and have declared expertise and am a published author on the subject. If I don't understand the content and context, then who does?

:::::Note: I have removed the disputed paragraph as there is no consensus of the facts, and I guide Attic Salt towards policy of ], ] and ]. This edit shows this applies to Attic Salt , especially as you have not proven that "Confusing assertion that Rigel B is "likely" a triple star, when body of article only says "might". Then rest of paragraph only discusses Ba and Bb. So remove." (While writing this response, Attic Salt has again reverted this edit under the excuse "Restore material deleted without explanation." The above is the explanation. Instead of falling in edit warring, I will just tag the section as ] . ] (]) 02:08, 14 April 2019 (UTC)

::{{ping||Lithopsian}} I have restored most of this edit Saying as an reason that; "too much of a mess of contradictions and flow problems, give up and start again from the previous version" is quite unjustified. Again, it looks like deliberate provocation in which I've pointed out before., as have reasonably attempt to improve the text. Perhaps you missed this talkpage section and the need to fix this paragraph. Frankly. If you think it has 'contradictions or flow problems', then prove it. If it is wrong, then prove it. I do agree the text might need some tweaking or improvements or simplified, but this should at least done by consensus using ]. (This is made more difficult by you selectively refusing to interact with other editors, making ] impossible.) ] (]) 01:09, 13 April 2019 (UTC)

=='Cooling' stated in 'Physical characteristics' is Contradictory==

There is a significant contradiction in the text within the 'Physical characteristics' section.

{{quote|"Rigel is a ] that has exhausted the hydrogen fuel in its core, evolved away from the ], and expanded and cooled as it has progressed across the ]. (ref seeds) Stellar evolution theory finds that massive stars can make several reversals in direction Its pulsation properties suggest it may have already passed through the ] phase, although the surface abundances are only compatible with this if certain assumptions are made about internal convection. (ref saio)"}}

Each sentence says/implies the exact opposite, e.g. The Seeds cite says this, but the next sentence by Sato contradicts this. If it had passed through the red giant phase and the star is now a blue star, the star logically must be getting hotter. Discussion of this has already appeareds on the talkpage section 'Exhausted H in core vs Almost exhausted H in core' (with the Claudio Ritossa cite.) Factually, it maybe going either direction. Hence, "cooled" removal takes away this obvious contradiction, and even "expanded" is not necessarily true?

Since it has been reverted twice now, the article tags should remain until consensus is reached. ] (]) 03:54, 14 April 2019 (UTC)

:Comment. I did replace "and cooled" with "and brightened", which when looking at the H-R Diagram in Seeds reference, but even this increase in luminosity has the same problem with contradictions. ] (]) 04:08, 14 April 2019 (UTC)
::Thank you for explaining this. ] (]) 12:47, 14 April 2019 (UTC)
:::What part is the problem? Fact 1 - it has left the main sequence - ergo it has cooled and brightened. The issue is whether it has already been a red supergiant (hence has cooled and it getting hotter), or is still cooling. So you arguing about Fact 1 is plainly wrong. I find it hard to assume good faith with this. Hence this is what we write. ] (] '''·''' ]) 13:49, 16 April 2019 (UTC)

:::In fact, Arianewiki1 rather than dumping crap on everything (again) with tags, why don't ''you'' write in plain, succinct and grammatical English what you think it should say? ] (] '''·''' ]) 13:55, 16 April 2019 (UTC)

==Third Attempt With Introduction==

Modification of Paragraph 2 & 3 has been attempted here. I've merged a older 'stable' version of the disputed text on the multiple star and added the clarifications of the most recent versions. It is a better compromise that previous versions.

The Paragraphs 2 and 3 have also been reversed, and follows the order of article section 'Stellar system' followed by 'Physical characteristics' of the main star.

Further changes or issues should continue here to get a consensus version. ] (]) 00:01, 15 April 2019 (UTC)
:Interesting that you say that a consensus version of the paragraph should be developed here, immediately after you made a wholesale change of the same paragraph. ] (]) 20:28, 15 April 2019 (UTC)
::Yes. Consensus appears to be whatever Arianewiki1 is his preferred version at the time. ] (] '''·''' ]) 20:43, 15 April 2019 (UTC)
:::OK. I'm dealing with ]. So be it. Why don't you guys understand that consensus requires a degree of compromise? Yet any thought of some compromise edit or simple mistake finds a revert of everything - regardless of the context or your understanding. Both of you should understand ] , and know: "Do not engage in discussions in edit summaries. Doing so is a hallmark of edit warring; instead, stop editing and use the talk page." So far, I've followed these precepts. I brought up these issues many times within the talkpage here using ]. Bemoaning the constant changes doesn't fix the problems.<!--Example: A really good example is this ] recent edit here, which now satisfies the ongoing discussion that has been going on for weeks here. Constant revisions by Attic Salt just ignored that the companion stars were a triple star - especially saying. "<i>These stars" (meaning Rigel Ba and Bb) "forming" a physical triple star orbiting its bright supergiant primary. Very confusing, as it sounds like you are saying that two stars (Ba and Bb) are a triple.</i>" I corrected and discussed this (above) by adding "The companion is itself a close triple star system with a combined ] of 6.7 that appears as a single star except in very large telescopes. It includes a spectroscopic pair (Rigel Ba and Rigel Bb) and a visual companion, Rigel C. " so this wasn't misunderstood. Attic Salt partially adds: "Rigel B and C are very close to each other, approximately equal in brightness, and appear as a single star except in very large telescopes.", again ignoring that it is three stars (a triple star). I've again corrected this here with the implicit: "Rigel B is itself a close triple star system that includes a spectroscopic pair (Rigel Ba and Rigel Bb) and a visual companion, Rigel C. These three components appears as a single star except in very large telescopes. Component C has a very similar brightness and is B spectral class." Lithopsian recent edit here simplifis this to: "It includes a visual pair, Rigel B and C, and a spectroscopic pair Rigel Ba and Bb, although historically the whole triple system was referred to as Rigel B."-->
:::If Attic Salt's is now complaining to Arianewiki1 that "Interesting that you say that a consensus version of the paragraph should be developed here, immediately after you made a wholesale change of the same paragraph." then what is the consensus here?
:::Cut to the chase. Instead of dancing around the problem, answer this:
:::<b>Do we have consensus that "Rigel B" constitutes a triple star system?</b> Yes or No. ] (]) 03:02, 16 April 2019 (UTC)
::The problem is the text needs to be factual, and the continued revisions kept breaking the meaning or correct terminology. I have now several times created a version that is true, but each following edit again ignores the need context. A good example is the revert by Attic Salt justified by saying "<i>These stars" (meaning Rigel Ba and Bb) "forming" a physical triple star orbiting its bright supergiant primary. Very confusing, as it sounds like you are saying that two stars (Ba and Bb) are a triple.</i>" They were repeatably that the triple is Rigel Ba, Rigel Bb & Rigel C - plainly counting three different stars. Sure, the text might be grammatically improved, but it must continue to be factual.
::To get consensus, it is important we agree on the facts as presented. e.g. If, for example: "It includes a visual pair, Rigel B and C, and a spectroscopic pair Rigel Ba and Bb, although historically the whole triple system was referred to as Rigel B." Do either of you agree with that statement, then?
::If we did follow Attic Salt's version there are four factual errors and the whole context is wrong.
::Comparing the versions:
#{{quote|"Separated from Rigel by {{val|9.5|ul="}}, two companion stars, Rigel B and Rigel C, are very close to each other and approximately equal in brightness. They are a ] that can be resolved by a moderately sized telescope. Together they have a combined apparent magnitude of 6.7 or 400 times fainter than the supergiant primary star. Rigel B is itself a much closer ], with components Ba and Bb that are separated by less than {{val|1|ul=mas}}."}}

#{{quote|"Although appearing as a single star to the naked eye, Rigel is actually part of a multiple star system containing at least four stars. Usage of the name Rigel strictly refers to only the brightest component, although it is commonly applied to the whole system. A visual 6.7 magnitude companion, Rigel B, lies 9.5″ away and is 400 times fainter than the supergiant primary. This is readily visible in a small telescope. Rigel B is itself a close triple star system that includes a spectroscopic pair (Rigel Ba and Rigel Bb) and a visual companion, Rigel C. These three components appears as a single star except in very large telescopes. Component C has a very similar brightness and is B spectral class."}}

#{{quote|"Although appearing as a single star to the naked eye, Rigel is actually part of a multiple star system. The name Rigel strictly refers to only the brightest component, although it is commonly applied to the whole system. The supergiant primary has a companion 9.5″ away and 400 times fainter. The companion is itself a close triple star system with a combined visual magnitude of 6.7 that appears as a single star except in very large telescopes. It includes a visual pair, Rigel B and C, and a spectroscopic pair Rigel Ba and Bb, although historically the whole triple system was referred to as Rigel B."}}

::Which version is better then?
::So what else now needs to be added or corrected to the final paragraph if adopted?

::Should this paragraph be Paragraph 2 or Paragraph 3, based on the order in article or under the subject's title?
:::Note: We are talking about getting consensus on context and facts NOT grammatical BS. ] (]) 00:25, 16 April 2019 (UTC)
::::I still find it interesting that you want “consensus” immediately after making wholesale changes. ] (]) 01:11, 16 April 2019 (UTC)
:::::Making unfounded and misleading statements is really bad form. i.e. I have not asked at all for ""consensus" immediately" nor made "wholesale changes." Saying so is an ad hominem and is a ]. Consensus is a process that is worked towards between editors. It takes time. If anything, refusing to refute my arguments, is avoiding consensus building. ] is clear. "Consensus can be assumed if no editors object to a change. Editors who ignore talk page discussions yet continue to edit in or revert disputed material, or who stonewall discussions, may be guilty of disruptive editing and incur sanctions."
:::::As I said this above: "Cut to the chase. Instead of dancing around the problem, answer this:"
:::::<b>Do we have consensus that "Rigel B" constitutes a triple star system?</b> Yes or No. ] (]) 04:36, 16 April 2019 (UTC)
::::::Sort of. It could be Rigel B or Rigel BC. More easily introduced first as Rigel B and then explained. ] (] '''·''' ]) 13:39, 16 April 2019 (UTC)

I came here per a RfC, posted above before seeing this, so am moving my comments here w/o reading all the above. Much of this looks like it's already be resolved, so you don't need my input. But I suspect that my last comment, about the IAU only allowing names in the English alphabet (what they ignorantly call the "Latin" alphabet) is not widely known and may prove interesting.
:There's nothing wrong with "Rigel B" etc., as long as we're clear that these are officially informal names. It would probably be a good idea to link such informal names with their official designations in the lead (of the article or section), so that they're unambiguously defined, and then, if convenient, use the informal name in the rest of the text.
:The 2015–2018 triennial report, in §2.2 'Multiple Stars', states, ''The '''informal names''' often attributed to other components in a physical multiple (e.g., 'Fomalhaut B') are treated as '''unofficial''', and not included in the IAU Catalogue of Star Names.'' There is a footnote, ''As these '''useful nicknames''' with the form often appear in the literature, many appear in the SIMBAD database.''
:It would seem therefore that the IAU has no problem with people using e.g. "Rigel B", and indeed suggests it may be useful for them to do so, but presumably for the sake of clarity they will not do so themselves. I don't see any reason why we shouldn't use them here at WP. The decision to my mind is similar to deciding whether to use an official IAU proper name or the designation in an article, based on what's common in the lit and what reads well. A simple nickname would IMO trump the official designation if there are so many letters floating around that a reader may have difficulty keeping track of them.
:The IAU speaks of "guidelines", and even if they didn't we wouldn't need to abide by their whims. We can use proper names they've not (yet) adopted, for example. We can speak of the "Rigel system". If the astro lit eventually comes to embrace the IAU (or some less clunky development of the current guidelines), then we should follow, but we don't need to lead the way just to be "official".
:One of the general problems with the naming conventions, though not relevant to this article, is that when the IAU says names must be in the "Latin" alphabet, they actually mean the ] (or an English-language keyboard), but are not knowledgeable or honest enough to say so. There is no j or w in the Latin alphabet, for example, but those letters are acceptable to the IAU because they're in the English alphabet. However, French ç, Spanish ñ, German ß, Danish æ and Icelandic ð -- all extensions of the Latin alphabet equivalent to English j and w (and two of them formerly found in English) -- are not acceptable because they're not (or no longer) in the English alphabet. Chinese names are supposed to be transcribed in ], but none of the Chinese names so far adopted actually ''are'' in pinyin, as they're missing tone-marking (and probably wouldn't be written with ü if required. Though, to be fair, the Chinese themselves omit tone-marking in telegraphy.) ''We'' don't need to abide by this, and it may not prove to be stable for the IAU anyway. A skirmish against this bias was recently won with the TNO name ]: initially the IAU naming committee balked because it wasn't in the "Latin" alphabet. Of course, it's in *a* Latin alphabet, just not in the English alphabet. They explained at the time that they wouldn't accept German names with ß either. But eventually they caved, and published the name with proper orthography (p.6, though with a layout fudge rather than Unicode, so it won't copy-paste faithfully). If star names require non-English letters or diacritics to read properly or be faithful to the lit, it's possible the IAU may cave here too. — ] (]) 00:05, 17 April 2019 (UTC)

==Physical characteristics & Nomenclature : Unjustified Reverts==
{{ping|Ritchie333}} {{ping|Lithopsian}} According to ] the made this deliberate revert reasoning "<i>revert the whole fantasy explanation of supergiant evolution, based on a book about red giants.</i>" Ignoring the ], there is no justification to do this and no consensus. Even if there are complaints of this text and cites, the explanation and cites also appears in the article page on ].
It is clear this revert is probably a knee-jerk reaction to the previous recent edit above here. This behaviour is unacceptable.

{{quote| Rigel is a blue supergiant that has already exhausted the hydrogen fuel in its core. It has evolved away from the main sequence, expanded and surface temperature cooled, and now lies in the upper part of the Hertzsprung–Russell diagram. When the star crossed the main sequence, and began converting hydrogen into helium in its core, the surface temperature would have been around 30,000 K. Rigel's pulsation properties as a variable star suggest it could have already passed through its red supergiant phase and then increased in temperature to become a blue supergiant for a second time. Depending on the stellar mass mass and composition of this initial red supergiant, Rigel may execute a number of so-called blue loops, caused by variations in energy production occurring in the shells. Chemical surface abundances seen in the spectrum are compatible with this only if its internal convection zones are modelled using non-homogeneous conditions known as the Ledoux Criteria. Rigel is expected to eventually end its stellar life as a Type II supernova, in the process ejecting material that could seed future generations of stars. It is one of the closest known potential supernova progenitors to Earth, and would be expected to have an apparent magnitude of around −11 at its peak.}}
to
{{quote|Rigel is a blue supergiant that has exhausted the hydrogen fuel in its core, expanded and cooled as it moved away from the main sequence across the upper part of the Hertzsprung–Russell diagram. When it was on the main sequence, its temperature would have been around 30,000 K. Rigel's pulsation properties suggest it may have already passed through a red supergiant phase and then increased its temperature to become a blue supergiant for a second time, something that is expected for some sufficiently massive stars. The surface abundances seen in the spectrum are compatible with this only if its internal convection zones are modelled using non-homogeneous chemical conditions known as the Ledoux Criteria. Rigel is expected to eventually end its stellar life as a supernova, in the process ejecting material that will serve to seed future generations of stars. It is one of the closest known potential supernova progenitors to Earth, and would be expected to have an apparent magnitude of around −11 at its peak.}}

I do not know which book Lithopsian refers, nor what is the exact 'fantasy' is, but the differences are minor.

An objection might be "crossed the main sequence" versus "When it was on the main sequence", but it is mostly trivial.

If the central objection is to "Depending on the stellar mass mass and composition of this initial red supergiant, Rigel may execute a number of so-called blue loops, caused by variations in energy production occurring in the shells.", well ] says "Depending on the exact mass and composition of a red supergiant, it can execute a number of blue loops before either exploding as a type II supernova or finally dumping enough of its outer layers to become a blue supergiant again, less luminous than the first time but more unstable." Using the same source, I added Typer II supernova to the following line.

Extraordinarily, Lithopsian cites this same text here. They are reverting material they've already endorsed.

Other than that, there is not real differences here, and there is no real reason to revert everything. As such, I have reinstated this text, and request that they engage on this talkpage.

:NOTE: On the evidence the edit appears to be made in vindictive spite than on editing principles. Verification of this attitude appears in the next blanking here in saying "<i>and the misrepresentation of WDS discoverer codes which was snuck back in again in an uncommented edit.</i>" However, this text has been extensively been discussed above, the sources verify the usage, consensus and a compromise on the article's usage. (It this IAU's 'official' usage, based on recommendation by the US Naval Observatory who maintains the WDS.) Worse, they have been told this is ] here and is explained in full by me under 'Unhelpful edits on Rigel's Nomenclature' made here. As they have not responded to this, and refuses to engage with Arianewiki1 on talkpages, they have no consensus and is ignoring ].
:As for the claim of "in an uncommented edit." Policy is crystal clear. H:FIES makes clear, it is not a requirement to provide edit summaries. That section notes that it can increase the risk of edits being reverted if their purpose is unclear, but does not authorise this. As H:ES says "<i>It is not one of Misplaced Pages's policies or guidelines, as it has not been thoroughly vetted by the community.</i>" There is no justification to revert any edit just because it does not have an edit summary. ] (]) 02:02, 20 April 2019 (UTC)

:This is getting tiresome. When I attempt to discuss content with you, then I get accused of violating any and every policy going, acting in bad faith, am met with walls of words that are almost impossible to follow, and you maintain your bizarre interpretation of the subject in the face of any editor who dares to disagree. When I don't engage then I'm accused of violating any and every policy going and being "vindictive". Whenever it looks like you can't batter every other editor into submission on an article, you try to pick them off with threats and warnings n personal talk pages. Hence no discussion of content is possible with you, so get used to it. But just one final time: I'm not modifying your edits because I'm being vindictive, or because I'm trying to game the system, or because you forgot to dot some imaginary ''i'' or cross some obscure policy ''t''; it is because you write a lot of rubbish.
] (]) 14:56, 21 April 2019 (UTC)
::Agree with Lithopsian. ] (]) 15:00, 21 April 2019 (UTC)
::Again, discussions on ] reverts in this Section are being avoided, especially the contradiction with the same cite that you yourself added on ]. The rest of this response is quite unacceptable, and really should be made on User talkpages but not here. ] (]) 04:04, 22 April 2019 (UTC)

== RfC: Inclusion of this statement under 'Nomenclature'==

{{rfc|sci|rfcid=52C893C}}

Should these two statements about ]'s single/double/multiple star nomenclature be included in final paragraph of the Rigel section 'Nomenclature':

<blockquote>"Alternative designations from the ] are double stars: STF 668A,BC, BU 555AD, BU 555BC.<ref name="WDS">{{cite journal | display-authors=1 | last=Mason | first=Brian D. | last2=Wycoff | first2=Gary L. | last3=Hartkopf | first3=William I. | last4=Douglass | first4=Geoffrey G. | last5=Worley | first5=Charles E. | title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog | journal=The Astronomical Journal | volume=122 | issue=6 | pages=3466–3471 | date=December 2001 | doi=10.1086/323920 | bibcode=2001AJ....122.3466M | url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/WDS | accessdate=13 March 2016 }}</ref><ref name="WGSN2018">{{cite web |last1=Division C: Working Group on Star Names |title=Triennial Report: 2016-2018 |url=https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf |accessdate=24 March 2019}}</ref><ref name="simbad2">{{cite simbad | title=bet Ori B | access-date=2019-04-23}}</ref>, and as individual stars: STF 688B<ref name="simbad2"/> for Rigel B<ref name="simbad1">{{cite simbad | title=Rigel B | access-date=2019-04-23}}</ref>, as BU 555Ba, BU555Bb, BC 555C and BU 555D for Rigel Ba, Bb, C and D respectively.<ref name="Dickel2000">{{cite book|
|last1=Dickel |first1=H.R.
|last2=Malkov |first2=O.Yu.
|title= New IAU Concepts of Binary/Multiple Star Designation
|year=2000
|booktitle=Birth and Evolution of Binary Stars, Poster Proceedings of IAU Symposium No. 200 on The Formation of Binary Stars, held 10–15 April 2000, in Potsdam, Germany.
|volume=200
|page=220-203
|doi=10.1515/astro-2017-0218
|bibcode= 2000IAUS..200P.220D
|url=http://adsabs.harvard.edu/abs/2000IAUS..200P.220D}}</ref><ref name ="Kovaleva2015">{{cite journal|
|last1=Kovaleva |first1=D.A.
|last2=Malkov |first2=O.Yu.
|last3=Kaygorodov|first3=P.V.
|last4=Karchevsky|first4=A.V.
|last5=Samus|first5=N.N.
|title= Bsdb: a new consistent designation scheme for identifying objects in binary and multiple stars
|journal=Baltic Astronomy
|volume=24
|pages=185–193
|doi=10.1515/astro-2017-0218
|bibcode= 2015BaltA..24..185K
|url=http://articles.adsabs.harvard.edu/full/2015BaltA..24..185K}}</ref> The whole multiple star system is known as ] 05145-0812 or ] 05145-0812."<!-- SIMBAD adds J i.e. WDS J05145-0812 or CCDM J05145-0812--> </blockquote>

<b>CONTEXT</b>: The main objections previously given in the edit summaries are: "..misrepresentation of WDS discoverer codes " and "…confusing to mix up WDS discoverer codes with double star designations" , however, all these citations appear to verify these statements and do show general or adopted usage. Furthermore, the 'unofficial' usage of Rigel B, Rigel Ba, Rigel Ba, Rigel C and Rigel D used throughout the ] page links these to the more formal designations that can be found in astronomical sources, such as SIMBAD. Adding this information seems to be both uncontroversial and not harmful to the article. ] (]) 02:04, 23 April 2019 (UTC)

:<b>Oppose</b> because the infobox already gives a long list of aliases for these stars. And that is the place where these (and other) alternative names (such as in the proposed text) can be given. ] (]) 12:47, 23 April 2019 (UTC)

*'''Oppose''': the sentence is both misleading and confusing. The implication is that these designations are somehow special or official for the various components. However, they are neither: they are merely referring to the discoverer of each pair and giving the WDS latinized version of the designations assigned by the discoverers. The inclusion of component pair designations in the same sentence as individual component designations, without proper explanation, is confusing. Doubly so when the designation for the pairs do not match the designations for the individual components, and not helped by the grammatical errors. The listing of these rather obscure designations, essentially unused in the last half century, in preference to better-known designations such as ADS, is unwarranted. Lastly, the implication that the system as a whole should only be referred to by the CCDM or WDS designations just makes the whole thing very unhelpful. They should be included only a part of a full description of multiple star designations as applicable to Rigel, or left to the starbox. <!-- Template:Unsigned --><small class="autosigned">—&nbsp;Preceding ] comment added by ] (] • ]) </small>
*<b>Support</b>: The previous discussion here clearly shows usage in the Washington Double Star Catalogue. It is also clear that most of this article agrees with the general use of Rigel B, Rigel C, etc. for components, but with this inclusion, explains what the accepted names and usage formally is. The cites confirm this. However, the explanation is made in the WDS Bible. Here the discovery codes and components, where it says:
<blockquote>Components, when the object has more than two. The Lick IDS scheme has been discontinued, and components are now referred to by the traditionally employed lower-case letters. The rather awkward upper-case designations, e.g. ABXC, have been changed to the form AB-C, etc. We have noted some confusion on the part of observers and students alike, as to how to designate components in multiple systems. Traditionally, these have been designated in order of separation, thus AB, AC,...., or in the cases where close pairs are observed blended, AB-C, AB-D,.... In some instances, differing resolution limits produce situations where observations are intermixed, thus AC, AB-C, and so forth (in all too many cases, carelessness on the part of the observer does not permit us to determine with certainty how the observation is to be interpreted). There are also many instances where later observations have revealed a closer companion; these are designated Aa, Bb, etc. In a few cases wider, later discoveries have also been so denoted.</blockquote>
:This seems to belay most of the two previous opposer's assertions.
:The assertion that this usage is either "implication is that these designations are somehow special or official for the various components. However, they are neither" or are "obscure designations, essentially unused in the last half century" is quite misplaced. The support for this is found here, explaining: "….the resultant catalog, redesignated the "Washington Double Star" (WDS) Catalog, has been the official double star catalog of Commission 26 (Double and Multiple Stars) of the International Astronomical Union (IAU)." Further evidence of current usage JDSO April 2019, JDSO Publication Guide "Identifier: Discovery Designation or WDS coordinate is preferred"
:The assertion: "Lastly, the implication that the system as a whole should only be referred to by the CCDM or WDS designations just makes the whole thing very unhelpful" An specific example is this paper here, saying in the abstract: "...measured the position angle and separation of the multiple star system WDS 16579+4722, AB and AC components."
:On the evidence and supporting citations, it is extraordinary that any one would oppose this. (I am an author on double stars, and will even have a new book published next month using this nomenclature.) ] (]) 00:15, 24 April 2019 (UTC)

{{talkref}}

== RfC: Inclusion Three Possible Statements under 'Physical characteristics'==

{{rfc|sci|rfcid=24FD083}}

Which of these three statements about ]'s becoming a Type II supernova in the final paragraph of the Rigel section 'Physical characteristics' Paragraph 3 should be used:

<blockquote><b>Statement 1</b> : Rigel is expected to eventually end its stellar life as a ], in the process ejecting material that will serve to seed future generations of stars.</blockquote>

<blockquote><b>Statement 2</b> Rigel is expected to eventually end its stellar life as a ], in the process ejecting material that will serve to seed future generations of stars.</blockquote>

<blockquote><b>Statement 3</b> Rigel is expected to eventually end its stellar life as a ].</blockquote>

Citable references for Statement 2 could be either: Guinan (2010) , stating
"Rigel (along with its co-asterism Betelgeuse) is likely to be the nearest progenitor of a Type II supernova" (already listed), or Moravvaji et al. (2012) saying in the first line of the abstract. "Rigel (beta Ori, B8 Ia) is a nearby blue supergiant displaying alpha Cyg type variability, and is one of the nearest type-II supernova progenitors."

Further support appears ] 2nd paragraph , where is says "exploding as a type II supernova."

Furthermore, the statement about supernova ejecta is quite unnecessary, because it applies to all supernovae, and not just Rigel. Statement 3 removes this ambiguity.

Counter arguments of the possibility that Rigel won't go supernova are highlighted in the ] 2nd paragraph, however, both the references by Maeder & Meynet (2001) and Stothers & Chin (2001), do not reference Rigel or Rigel going supernova, but Stothers & Chin (2001) mostly describes the star's evolution "blue loops." Based on Rigel's mass stated elsewhere, I interpret Stothers & Chin (2001) concur Rigel becoming a Type II supernova as stated by Guinan (2010) and Moravvaji et al. (2012) .

<b>Which version should be adopted? Statement 1, Statement 2 or Statement 3?</b>

COMMENT: The words "….in the process ejecting material that will serve to seed..." perhaps could be changed to the much simpler "... whose ejecta could seed…" or other such variant,

NOTE: This RfC is necessary as one editor has repeatedly removed the Type II supernova scenario without explanation from the statement. ] (]) 05:08, 23 April 2019 (UTC)

*'''Comment''' Is there any real need for this RfC? I had a quick look at this talk page and the article history and can't see where the proposed change has been discussed or attempted. I see a lot of massive edits like which were rejected. But the normal way to deal with the rejection of massive edits is to make smaller ones, rather than starting an RfC on one specific proposal which was part of a massive rejected edit. Massive edits can be difficult to evaluate and comment on. I mean after all, the fact this RfC focuses on one specific issue seems to be recognition of the difficulty with massive edits. ] (]) 07:34, 23 April 2019 (UTC)
::Eh? The RfC your responding is about supernova not the last RfC above about double/ multiple star designations being related to this link. The debate that Rigel is to become a Type II supernova is the issue here. The question is simple: "Which version should be adopted? Statement 1, Statement 2 or Statement 3?" ] (]) 08:51, 23 April 2019 (UTC)

*'''Any of the three''': I'm not too fussed which of them is used. The references support the mainstream view that Rigel will likely explode as a type-II supernova. If this small change hadn't been buried at the end of a long edit about bizarre evolutionary theories with no edit comment, then I probably wouldn't have reverted it even once. The "type II" specifier was previously included way back but it stated "from a red supergiant" which the given reference explicitly contradicts, so I simplified it back then. ] (]) 15:37, 23 April 2019 (UTC)

*'''Statement 2''' but not fussed really, any would do. ] (] '''·''' ]) 02:37, 24 April 2019 (UTC)

*'''Possibly not Statement 2'''. I am concerned about the connection that the reader might make in statement 2 between Type II supernova, specifically, and "seeding" future generations of stars. Is this seeding unique to Type II supernova? If so, then statement 2 is fine. Otherwise, I am not in favor of statement 2, as it might be misinterpreted. ] (]) 13:01, 25 April 2019 (UTC)

== First couple of sentences in lede ==

Over the past day or so, we've had three versions of the first couple of sentences in the lede. Which do we like most?

'''1.''' Rigel /ˈraɪdʒəl/, also designated β Orionis (Latinized to Beta Orionis, abbreviated Beta Ori, β Ori), is a variable star. It is, on average, the seventh-brightest star in the night sky and the brightest star in the constellation of Orion.

'''2.''' Rigel /ˈraɪdʒəl/, also designated β Orionis (Latinized to Beta Orionis, abbreviated Beta Ori, β Ori), is a first-magnitude star and a known intrinsic variable star, whose changes in brightness are not readably seen by the naked-eye. It is, on average, the seventh-brightest star in the night sky and the brightest star in the constellation of Orion.

'''3.''' Rigel /ˈraɪdʒəl/, also designated β Orionis (Latinized to Beta Orionis, abbreviated Beta Ori, β Ori), is generally the seventh-brightest star in the night sky and the brightest star in the constellation of Orion. Its brightness varies slightly and it is occasionally outshone by Betelgeuse, itself a semi-regular variable star.

'''Option 1.''' This is the one that I favour. It is short (my general preference), and I think we need to state, up-front, that Rigel is a "variable star" before we start talking about its "general" brightness. Therefore, I don't favour option 3. I think that option 2 is trying to pack too much into the first sentence. Therfore, I don't favour option 2. ] (]) 20:44, 26 April 2019 (UTC)

Good to see your continuing to revert edits and now try to push through a version (Version 1) that is based on a illogical premise. Again, while Rigel might be a variable star, it is trivial fact about Rigel. Rigel is a bright ] in Orion. That is what it is known for. My dictionary says "the seventh brightest star in the sky, and the brightest in the constellation Orion. It is a blue supergiant nearly sixty thousand times as luminous as our sun." (Looks like plagiarism, but that is a different matter.) The statement that it a variable star is mostly irrelevant, because the variations cannot be seen to the naked eye, and it ranking changes because of the larger brightness range of Betelgeuse not Rigel. Also for self consistency, it should also reflect the article ], which is already rated as a good article (GA). (It doesn't mention 'variable star' straight up.)

Again. Stop changing the context of content.

*Technically, it is an ] variable star, because the changes are caused by the star itself. (It is not caused, say, be an eclipsing binary.) (You removed it,)
* I added the comment to aid editors "While the star technically might be variable, it is not the principle definition of Rigel as a bright star. Oddly, the Betelgeuse feature article doesn't use the qualifier 'variable star', as used here." (You removed it.)
* You removed ], which has a specific meaning. (Rigel is listed in this article.)
* You removed "highly contrasts" which was linked here The reason why this is notable is that one star is blue and the other is red. The contrast is enhanced, which is why it is so noted.
* You changed "semi-regular variable star" when the linked article is named "semiregular variable star."

Frankly, your edits are not a ], and the evidence suggest problems with understanding context.

Your Option 1 is clearly based on a wrong premise and lacks context. Option 2 shows why is is a wrong premise, while Option 3 is a fair compromise. ] (]) 23:12, 26 April 2019 (UTC)
:The article contains quite a lot of discussion of Rigel's variability. Thanks, ] (]) 23:19, 26 April 2019 (UTC)
::I'd probably go with option 3 - it is only slightly variable. I think the main thing is that it is bright foremost. ] (] '''·''' ]) 23:37, 26 April 2019 (UTC)

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Absolute magnitude

Rigel is actually a multi star system. But the energy output of its components other than the main star are negligable. Its average apperent magnitude is m=0.13 and the distance is d=860 ly. With these figures its absolute magnitude should be M= -6.97 . But the article gives the figure as M= -7.84. Have I missed something? Nedim Ardoğa (talk) 14:42, 6 January 2021 (UTC)

Yes, you missed something. First, the references given for the apparent magnitude, the distance, and the absolute magnitude are not the same, so they are not necessarily consistent. In fact the reference for the absolute magnitude (which I just changed to the original paper that derived the value instead of one that was just quoting it) assumed a distance of 360 pc. There is also extinction, which many people forget about. In this case it isn't obvious how many magnitudes of extinction have been included in the calculation because the paper goes directly from the distance modulus and colour excess to the absolute magnitude. However, the difference between the distance modulus and the absolute magnitude makes it fairly clear that there are about 0.16 magnitudes of extinction in there. That is consistent with the E(B-V) of 0.05. Lithopsian (talk) 17:27, 6 January 2021 (UTC)

Distance

The first paragraph gives a distance of 860 light-years (260 pc) from Earth. Yet the sidebar lists Distance 1,010 ± 20 ly (309 ± 5 pc). KevinTernes (talk) 14:15, 15 September 2021 (UTC)

Thanks for pointing that out. I took a look and it seems that the infobox value was obtained using another method, but the value of 860 ly (863, to be exact) is the more widely accepted value. I have updated the infobox and added a reference. -Pax Verbum 18:54, 15 September 2021 (UTC)
The distance isn't consistent now to the measured parallax - which i think is a pretty accurate method for this distance. The simbad database also states that the Parallax is actually 3.78 (compare: https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Rigel). Should the parallax be changed to reflect this value? Or is the gaia data which was used for the 3.2 value more accurate? 194.113.40.61 (talk) 07:18, 13 February 2023 (UTC)
The parallax in the starbox is for Rigel B. It should probably have a note to that effect since it isn't obvious from the reference. Yes, it is fairly accurate, but it is also somewhat indirect and potentially doesn't reflect the actual distance of Rigel. The parallax shown at Simbad for Rigel A is the old Hipparcos parallax because Gaia can't yet provide a useful parallax for such bright stars. The Hipparcos value is still widely-used as the "reference" distance for Rigel. Lithopsian (talk) 14:51, 13 February 2023 (UTC)

Pronunciation

I would rhyme this with Nigel, but is that correct? Would it be a hard G? — Preceding unsigned comment added by 2A01:4C8:1428:C467:F0B7:ED5:AF2E:FE81 (talk) 07:12, 2 January 2022 (UTC)

I rhyme it with Nigel, the 'g' as in jam. Some pronunciation guides give a hard 'g', but I haven't heard this actually being used. Lithopsian (talk) 17:38, 2 January 2022 (UTC)
And that corresponds to the tri-literal root RJL of the Arabic name (ar-Rijl al-Jauza, the foot of the giant). -- Elphion (talk) 18:27, 2 January 2022 (UTC)

Evolutionary stage

The sidebar says that Rigel is on the main sequence but the text says that it has evolved away from the main sequence. Presumably the text is correct 155.137.25.15 (talk) 11:20, 21 March 2022 (UTC)

The sidebar says that the faint companion, or at least one component of it if it is a binary, is on the main sequence. It describes the primary star (component A) as being a blue supergiant. Lithopsian (talk) 20:36, 21 March 2022 (UTC)
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