Misplaced Pages

Epsilon Corvi

Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
(Redirected from Minkar) Red giant star in the constellation Corvus
ε Corvi
Location of ε Corvi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Corvus
Right ascension 12 10 07.48058
Declination –22° 37′ 11.1620″
Apparent magnitude (V) +3.024
Characteristics
Spectral type K2 III
U−B color index +1.458
B−V color index +1.318
Astrometry
Radial velocity (Rv)+4.9 km/s
Proper motion (μ) RA: –71.74 mas/yr
Dec.: +10.25 mas/yr
Parallax (π)10.26 ± 0.16 mas
Distance318 ± 5 ly
(97 ± 2 pc)
Absolute magnitude (MV)−1.82+0.15
−0.14
Details
Mass3.2 M☉
Radius52 R☉
Surface gravity (log g)2.16 cgs
Temperature4320 K
Metallicity –0.13 dex
Rotational velocity (v sin i)1.0 km/s
Other designations
2 Crv, BD−21° 3487, FK5 453, HD 105707, HIP 59316, HR 4630, SAO 180531.
Database references
SIMBADdata

Epsilon Corvi (ε Crv, ε Corvi) is a star in the southern constellation of Corvus. It has the traditional name Minkar /ˈmɪŋkɑːr/, from Arabic منقار minqar meaning "beak " The apparent visual magnitude is +3.0 and it is located at a distance of 318 light-years (97 parsecs) from Earth.

In Chinese, 軫宿 (Zhěn Sù), meaning Chariot (asterism), refers to an asterism consisting of ε Corvi, γ Corvi, δ Corvi and β Corvi. Consequently, ε Corvi itself is known as 軫宿二 (Zhěn Sù èr, English: the Second Star of Chariot.).

Epsilon Corvi is a red giant with a stellar classification of K2 III, having consumed the hydrogen at its core and evolved away from the main sequence. It has about three times the Sun's mass. The interferometry-measured angular diameter of this star is about 4.99 mas, which, at its estimated distance, equates to a physical radius of about 52 times the radius of the Sun. The effective temperature of the outer envelope is 4320 K, giving it an orange hue that is characteristic of a K-type star. Around 4 times as massive as the Sun, it spent much of its life as a main sequence star of spectral type B5V.

References

  1. ^ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
  2. ^ Celis S., L. (October 1975), "Photoelectric photometry of late-type variable stars", Astronomy and Astrophysics Supplement Series, 22: 9–17, Bibcode:1975A&AS...22....9C
  3. Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H
  4. Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W
  5. Carney, Bruce W.; et al. (March 2008), "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars", The Astronomical Journal, 135 (3): 892–906, arXiv:0711.4984, Bibcode:2008AJ....135..892C, doi:10.1088/0004-6256/135/3/892, S2CID 2756572
  6. ^ Melo, C. H. F.; et al. (August 2005), "On the nature of lithium-rich giant stars. Constraints from beryllium abundances", Astronomy and Astrophysics, 439 (1): 227–235, arXiv:astro-ph/0504133, Bibcode:2005A&A...439..227M, doi:10.1051/0004-6361:20041805, S2CID 10580797
  7. ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
    2 ⋅ R ∗ = ( 10 − 3 ⋅ 97 ⋅ 4.99 )   AU 0.0046491   AU / R ⨀ ≈ 104 ⋅ R ⨀ {\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 97\cdot 4.99)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 104\cdot R_{\bigodot }\end{aligned}}}
  8. ^ McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527
  9. "MINKAR -- Variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-23
  10. Al-Sufi, Book Of Fixed Stars, Constellation: The Crow
  11. (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  12. (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived January 30, 2011, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  13. Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
  14. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2012-03-18, retrieved 2012-01-16
  15. Kaler, James B. (Jim), "Minkar", Stars, University of Illinois, retrieved 12 July 2015
Constellation of Corvus
Stars
Bayer
Flamsteed
Variable
HR
HD
Other
Exoplanets
Nebulae
Galaxies
NGC
Other
Galaxy clusters
Astronomical events
Category
Categories:
Epsilon Corvi Add topic