BD+17°3248 - Misplaced Pages

(Redirected from BD +17° 3248) Star in the constellation Hercules

BD+17°3248
Observation data Epoch J2000 Equinox J2000
Constellation	Hercules
Right ascension	17 28 14.4690
Declination	+17° 30′ 35.848″
Apparent magnitude (V)	9.37
Characteristics
Spectral type	KII vw
U−B color index	+0.08
B−V color index	+0.66
Astrometry

Radial velocity (R_v)	–146.55 km/s
Proper motion (μ)	RA: −47.611(13) mas/yr Dec.: −22.366(13) mas/yr
Parallax (π)	1.2357 ± 0.0129 mas
Distance	2,640 ± 30 ly (809 ± 8 pc)
Absolute magnitude (M_V)	+2.16+0.74 −1.14

Details

Mass	0.55–0.85 `M`_☉
Radius	12.64+0.39 −0.93 `R`_☉
Luminosity	117±5 `L`_☉
Surface gravity (log g)	2.30 cgs
Temperature	5,200±150 K
Metallicity	–2.02 dex
Age	13.8±4 Gyr

Other designations
BD+17 3248, HIP 85487, PPM 133421
Database references
SIMBAD	data

BD+17°3248 is an old Population II star located at a distance of roughly 968 light-years (297 parsecs) in the Galactic Halo. It belongs to the class of ultra-metal-poor stars, especially the very rare subclass of neutron-capture (r-process) enhanced stars.

Since about 2000, the star has been studied with 3 telescopes: the Hubble Space Telescope, the Keck I telescope and the Harlan J. Smith Telescope at the McDonald Observatory of the University of Texas. Elemental abundances in the range from germanium (Z=32) up to uranium (Z=92) have been determined. The Hubble Space Telescope was used to observe the ultraviolet part of the stellar spectra. This allowed the measurement of platinum, osmium and, for the first time outside of the Solar System, gold. From barium (Z=56) onward, all elements show a pattern of r-process contribution to the abundances of the elements in the Solar system.

The University of Mainz and University of Basel groups of Karl-Ludwig Kratz and Friedrich-Karl Thielemann performed a comparison between the observed abundances for the stable element europium (Z=63) and the radioactive elements thorium (Z=90) and uranium (Z=92) to the calculated abundances of an r-process in a Type II supernova explosion. This allowed the age of this star to be estimated as about 13.8 billion years with an uncertainty of 4 billion years. A similar age was derived for another ultra-metal-poor star (CS31082-001) from thorium to uranium ratios. These stars were born several hundred million years after the Big Bang.

References

^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Carney, B. W. (May 1983), "A photometric search for halo binaries. I - New observational data", Astronomical Journal, 88: 610–641, Bibcode:1983AJ.....88..610C, doi:10.1086/113350
^ "BD+17 3248". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-03-10.
Bonifacio; et al. (July 2009), "First stars XII. Abundances in extremely metal-poor turnoff stars, and comparison with the giants", Astronomy and Astrophysics, 501 (2): 519–530, arXiv:0903.4174, Bibcode:2009A&A...501..519B, doi:10.1051/0004-6361/200810610, S2CID 119164253
^ Cowan, John J.; et al. (June 2002), "The Chemical Composition and Age of the Metal-poor Halo Star BD +17°3248", The Astrophysical Journal, 572 (2): 861–879, arXiv:astro-ph/0202429, Bibcode:2002ApJ...572..861C, doi:10.1086/340347, S2CID 119503888
^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ Burris, Debra L.; et al. (November 2000), "Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-poor Giants", The Astrophysical Journal, 544 (1): 302–319, arXiv:astro-ph/0005188, Bibcode:2000ApJ...544..302B, doi:10.1086/317172, S2CID 33015452

External links

Constellation of Hercules

Stars

Bayer	α (Rasalgethi) β (Kornephoros) γ δ (Sarin) ε ζ η θ ι κ (Marsic) λ (Maasym) μ ν ξ ο π ρ σ τ υ φ χ ψ ψ ω (Cujam)
Flamsteed	14 29 (h) 30 (g) 42 45 (l) 52 60 68 (u) 69 (e) 72 (w) 89 93 98 99 (b) 102 104 (A) 106 109 110 111 112 32 Oph
Variable	X AC AM BL DI DQ V446 V533 V772 V777 V838 V1674
HR	6669 6697 6806
HD	146389 (Irena) 147506 (Hunor) 149026 (Ogma) 152843 154345 155358 156668 159062 164595 164922
Other	BD +17° 3248 Furuhjelm 46 GD 362 Gliese 623 Gliese 638 Gliese 649 Gliese 686 GJ 3991 HAT-P-14 (Franz) HAT-P-18 HAT-P-67 Hercules X-1 GSC 02620-00648 Ross 640 TOI-2119 TrES-3 (Pipoltr) TYC 1031-1262-1 WASP-103 WISE 1738+2732 WISE 1741+2553

Exoplanets	14 Herculis b c HAT-P-14b (Sissi) HD 149026 b (Smertrios) HD 164922 b c WASP-103b

Star clusters	Messier 13 Messier 92 NGC 6229 Palomar 14

Nebulae	Abell 39 NGC 6210

Galaxies

NGC	6028 6039 6040 6041 6042 6043 6044 6045 6046 6047 6052 6053 6054 6055 6056 6057 6061 6078 6158 6166 6181 6207 6212 6239 6261 6263 6308 6452 6560
Other	1ES 1741+196 2MASX J16270254+4328340 3C 345 3C 346 A2261-BCG Arp 272 (NGC 6050 and IC 1179) AT2018cow IC 1182 IC 1189 Hercules Dwarf Hercules A IC 1192 IC 4617 Markarian 501 MCG+07-33-027 PGC 2046648 QSR J1819+3845 RX J1633.3+4718 UGC 11105

Galaxy clusters	Abell 2152 Abell 2199 Hercules Cluster Hercules Superclusters Zwicky's Triplet

Astronomical events	LBG-2377