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Epsilon Corvi

January 01, 1970

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 [of the crow]"[10] The apparent visual magnitude is +3.0[2] and it is located at a distance of 318 light-years (97 parsecs) from Earth.[1]

ε Corvi
Location of ε Corvi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Corvus
Right ascension 12h 10m 07.48058s[1]
Declination –22° 37′ 11.1620″[1]
Apparent magnitude (V) +3.024[2]
Characteristics
Spectral type K2 III[3]
U−B color index +1.458[2]
B−V color index +1.318[2]
Astrometry
Radial velocity (Rv)+4.9[4] km/s
Proper motion (μ) RA: –71.74 mas/yr
Dec.: +10.25 mas/yr
Parallax (π)10.26 ± 0.16 mas[1]
Distance318 ± 5 ly
(97 ± 2 pc)
Absolute magnitude (MV)−1.82+0.15
−0.14[5]
Details
Mass3.2[6] M☉
Radius52[7] R☉
Surface gravity (log g)2.16[8] cgs
Temperature4320[8] K
Metallicity [Fe/H]–0.13[8] dex
Rotational velocity (v sin i)1.0[6] km/s
Other designations
2 Crv, BD−21° 3487, FK5 453, HD 105707, HIP 59316, HR 4630, SAO 180531.[9]
Database references
SIMBADdata

In Chinese, 軫宿 (Zhěn Sù), meaning Chariot (asterism), refers to an asterism consisting of ε Corvi, γ Corvi, δ Corvi and β Corvi.[11] Consequently, ε Corvi itself is known as 軫宿二 (Zhěn Sù èr, English: the Second Star of Chariot.).[12]

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.[6] The interferometry-measured angular diameter of this star is about 4.99 mas,[13] which, at its estimated distance, equates to a physical radius of about 52 times the radius of the Sun.[7] The effective temperature of the outer envelope is 4320 K,[8] giving it an orange hue that is characteristic of a K-type star.[14] Around 4 times as massive as the Sun, it spent much of its life as a main sequence star of spectral type B5V.[15]

References edit

  1. ^ a b c d 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. ^ a b c d 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. ^ a b c 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. ^ a b 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:
     
  8. ^ a b c d 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 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. ^ , 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

January 01, 1970
epsilon, corvi, corvi, star, southern, constellation, corvus, traditional, name, minkar, ɑːr, from, arabic, منقار, minqar, meaning, beak, crow, apparent, visual, magnitude, located, distance, light, years, parsecs, from, earth, corvilocation, corvi, circled, o. Epsilon Corvi e Crv e Corvi is a star in the southern constellation of Corvus It has the traditional name Minkar ˈ m ɪ ŋ k ɑːr from Arabic منقار minqar meaning beak of the crow 10 The apparent visual magnitude is 3 0 2 and it is located at a distance of 318 light years 97 parsecs from Earth 1 e CorviLocation of e Corvi circled Observation dataEpoch J2000 Equinox J2000 Constellation Corvus Right ascension 12h 10m 07 48058s 1 Declination 22 37 11 1620 1 Apparent magnitude V 3 024 2 Characteristics Spectral type K2 III 3 U B color index 1 458 2 B V color index 1 318 2 AstrometryRadial velocity Rv 4 9 4 km sProper motion m RA 71 74 mas yr Dec 10 25 mas yrParallax p 10 26 0 16 mas 1 Distance318 5 ly 97 2 pc Absolute magnitude MV 1 82 0 15 0 14 5 DetailsMass3 2 6 M Radius52 7 R Surface gravity log g 2 16 8 cgsTemperature4320 8 KMetallicity Fe H 0 13 8 dexRotational velocity v sin i 1 0 6 km s Other designations2 Crv BD 21 3487 FK5 453 HD 105707 HIP 59316 HR 4630 SAO 180531 9 Database referencesSIMBADdata In Chinese 軫宿 Zhen Su meaning Chariot asterism refers to an asterism consisting of e Corvi g Corvi d Corvi and b Corvi 11 Consequently e Corvi itself is known as 軫宿二 Zhen Su er English the Second Star of Chariot 12 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 6 The interferometry measured angular diameter of this star is about 4 99 mas 13 which at its estimated distance equates to a physical radius of about 52 times the radius of the Sun 7 The effective temperature of the outer envelope is 4320 K 8 giving it an orange hue that is characteristic of a K type star 14 Around 4 times as massive as the Sun it spent much of its life as a main sequence star of spectral type B5V 15 References edit a b c d van Leeuwen F November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Celis S L October 1975 Photoelectric photometry of late type variable stars Astronomy and Astrophysics Supplement Series 22 9 17 Bibcode 1975A amp AS 22 9C 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 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 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 a b c 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 amp A 439 227M doi 10 1051 0004 6361 20041805 S2CID 10580797 a b Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3rd ed Birkhauser 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 amp frac 10 3 cdot 97 cdot 4 99 text AU 0 0046491 text AU R bigodot amp approx 104 cdot R bigodot end aligned nbsp a b c d 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 MINKAR Variable Star SIMBAD Centre de Donnees astronomiques de Strasbourg retrieved 2012 01 23 Al Sufi Book Of Fixed Stars Constellation The Crow 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 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 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 amp A 431 773R doi 10 1051 0004 6361 20042039 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 Kaler James B Jim Minkar Stars University of Illinois retrieved 12 July 2015 Retrieved from https en wikipedia org w index php title Epsilon Corvi amp oldid 1215901149, wikipedia, wiki, book, books, library,

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