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Beta Corvi

October 20, 2023

Beta Corvi or β Corvi, officially named Kraz (/ˈkræz/),[11] is the second-brightest star in the southern constellation of Corvus with an apparent visual magnitude of 2.647.[2] Based on parallax measurements obtained during the Hipparcos mission, it is about 146 light-years (45 parsecs) distant from the Sun.

β Corvi
Location of β Corvi (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corvus
Right ascension 12h 34m 23.23484s[1]
Declination −23° 23′ 48.3374″[1]
Apparent magnitude (V) 2.647[2]
Characteristics
Spectral type G5 II[3]
U−B color index +0.586[2]
B−V color index +0.898[2]
R−I color index +0.44[4]
Astrometry
Radial velocity (Rv)−7.6[5] km/s
Proper motion (μ) RA: +1.11[1] mas/yr
Dec.: −56.56[1] mas/yr
Parallax (π)22.39 ± 0.18 mas[1]
Distance146 ± 1 ly
(44.7 ± 0.4 pc)
Absolute magnitude (MV)–0.61[6]
Details
Mass3.7±0.1[3] M☉
Radius16[7] R☉
Luminosity164[8] L☉
Surface gravity (log g)2.52±0.03[3] cgs
Temperature5,100±80[3] K
Metallicity [Fe/H]–0.01[6] dex
Rotational velocity (v sin i)8[9] km/s
Age206[3] Myr
Other designations
Kraz, β Crv, Beta Corvi, Beta Crv, 9 Corvi, 9 Crv, BD−22 3401, CD−22 3401, −22 9505, CPD−22 5388, FK5 471, GC 17133, HD 109379, HIP 61359, HR 4786, SAO 180915, PPM 260512[4][10]
Database references
SIMBADdata

Nomenclature Edit

β Corvi (Latinised to Beta Corvi) is the star's Bayer designation.

In a 1951 publication, Atlas Coeli (Skalnate Pleso Atlas of the Heavens) by Czech astronomer Antonín Bečvář, it bore the name Kraz, whose origin and meaning remain unknown.[12][13][14] In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Kraz for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[11]

In Chinese, 軫宿 (Zhěn Sù), meaning Chariot (asterism), refers to an asterism consisting of Beta, Gamma, Epsilon and Delta Corvi.[16] Consequently, Beta Corvi itself is known as 軫宿四 (Zhěn Sù sì, English: the Fourth Star of Chariot).[17]

Properties Edit

Beta Corvi has about 3.7 times the Sun's mass and is roughly 206 million years old,[3] which is old enough for a star of this mass to consume the hydrogen at its core and evolve away from the main sequence. The stellar classification is G5 II,[3] with the luminosity class of 'II' indicating this is a bright giant. The effective temperature of the star's outer envelope is about 5,100 K,[3] which produces a yellow hue common to G-type stars.[18]

The measured angular diameter of this star is 3.30 ± 0.17 mas.[7] At an estimated distance of 146 light-years (45 parsecs),[1] this yields a physical size of about 16 times the radius of the Sun.[13][19] Because of the star's mass and radius, it is emitting about 164 times the luminosity of the Sun.[8] The abundance of elements other than hydrogen or helium, what astronomers term metallicity, is similar to the proportions in the Sun.[6]

This is a variable star that ranges in apparent visual magnitude from a low of 2.66 to a high of 2.60.[20]

See also Edit

References Edit

  1. ^ a b c d e f 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 Gutierrez-Moreno, Adelina; et al. (1966). "A System of photometric standards". Publications of the Department of Astronomy University of Chile. Publicaciones Universidad de Chile, Department de Astronomy. 1: 1–17. Bibcode:1966PDAUC...1....1G.
  3. ^ a b c d e f g h Lyubimkov, Leonid S.; et al. (February 2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 402 (2): 1369–1379. arXiv:0911.1335. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x. S2CID 119096173.
  4. ^ a b HR 4786, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 9, 2008.
  5. ^ Evans, D. S. (June 20–24, 1966). Batten, Alan Henry; Heard, John Frederick (eds.). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications, Proceedings from IAU Symposium No. 30. University of Toronto: International Astronomical Union. 30: 57. Bibcode:1967IAUS...30...57E.
  6. ^ a b c Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781, S2CID 16258166
  7. ^ a b 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
  8. ^ a b Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M
  9. ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239 (1): 1. Bibcode:1970CoAsi.239....1B.
  10. ^ SV* ZI 946 -- Variable Star, database entry, SIMBAD. Accessed on line September 9, 2008.
  11. ^ a b "Naming Stars". IAU.org. Retrieved 18 June 2018.
  12. ^ Kunitzch, Paul; Smart, Tim (2006) [1986]. A Dictionary of Modern Star Names: A Short Guide to 254 Star Names and Their Derivations. Cambridge, Massachusetts: Sky Publishing Corporation. p. 62. ISBN 978-1-931559-44-7.
  13. ^ a b Kaler, James B., "KRAZ (Beta Corvi)", Stars, University of Illinois, retrieved 2012-12-28
  14. ^ Falkner, David E. (2011), The Mythology of the Night Sky: An Amateur Astronomer's Guide to the Ancient Greek and Roman Legends, Patrick Moore's Practical Astronomy, Springer, p. 81, ISBN 978-1-4614-0136-0
  15. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  16. ^ (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.
  17. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 2011-01-29 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  18. ^ , 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
  19. ^ 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:
     
  20. ^ Kukarkin, B. V.; et al. (1981), "Nachrichtenblatt der Vereinigung der Sternfreunde e.V. (Catalogue of suspected variable stars)", Nachrichtenblatt der Vereinigung der Sternfreunde, Moscow: Academy of Sciences USSR Shternberg, Bibcode:1981NVS...C......0K

October 20, 2023
beta, corvi, corvi, officially, named, kraz, second, brightest, star, southern, constellation, corvus, with, apparent, visual, magnitude, based, parallax, measurements, obtained, during, hipparcos, mission, about, light, years, parsecs, distant, from, corviloc. Beta Corvi or b Corvi officially named Kraz ˈ k r ae z 11 is the second brightest star in the southern constellation of Corvus with an apparent visual magnitude of 2 647 2 Based on parallax measurements obtained during the Hipparcos mission it is about 146 light years 45 parsecs distant from the Sun b CorviLocation of b Corvi circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation CorvusRight ascension 12h 34m 23 23484s 1 Declination 23 23 48 3374 1 Apparent magnitude V 2 647 2 CharacteristicsSpectral type G5 II 3 U B color index 0 586 2 B V color index 0 898 2 R I color index 0 44 4 AstrometryRadial velocity Rv 7 6 5 km sProper motion m RA 1 11 1 mas yr Dec 56 56 1 mas yrParallax p 22 39 0 18 mas 1 Distance146 1 ly 44 7 0 4 pc Absolute magnitude MV 0 61 6 DetailsMass3 7 0 1 3 M Radius16 7 R Luminosity164 8 L Surface gravity log g 2 52 0 03 3 cgsTemperature5 100 80 3 KMetallicity Fe H 0 01 6 dexRotational velocity v sin i 8 9 km sAge206 3 MyrOther designationsKraz b Crv Beta Corvi Beta Crv 9 Corvi 9 Crv BD 22 3401 CD 22 3401 22 9505 CPD 22 5388 FK5 471 GC 17133 HD 109379 HIP 61359 HR 4786 SAO 180915 PPM 260512 4 10 Database referencesSIMBADdata Contents 1 Nomenclature 2 Properties 3 See also 4 ReferencesNomenclature Editb Corvi Latinised to Beta Corvi is the star s Bayer designation In a 1951 publication Atlas Coeli Skalnate Pleso Atlas of the Heavens by Czech astronomer Antonin Becvar it bore the name Kraz whose origin and meaning remain unknown 12 13 14 In 2016 the IAU organized a Working Group on Star Names WGSN 15 to catalog and standardize proper names for stars The WGSN approved the name Kraz for this star on 1 June 2018 and it is now so included in the List of IAU approved Star Names 11 In Chinese 軫宿 Zhen Su meaning Chariot asterism refers to an asterism consisting of Beta Gamma Epsilon and Delta Corvi 16 Consequently Beta Corvi itself is known as 軫宿四 Zhen Su si English the Fourth Star of Chariot 17 Properties EditBeta Corvi has about 3 7 times the Sun s mass and is roughly 206 million years old 3 which is old enough for a star of this mass to consume the hydrogen at its core and evolve away from the main sequence The stellar classification is G5 II 3 with the luminosity class of II indicating this is a bright giant The effective temperature of the star s outer envelope is about 5 100 K 3 which produces a yellow hue common to G type stars 18 The measured angular diameter of this star is 3 30 0 17 mas 7 At an estimated distance of 146 light years 45 parsecs 1 this yields a physical size of about 16 times the radius of the Sun 13 19 Because of the star s mass and radius it is emitting about 164 times the luminosity of the Sun 8 The abundance of elements other than hydrogen or helium what astronomers term metallicity is similar to the proportions in the Sun 6 This is a variable star that ranges in apparent visual magnitude from a low of 2 66 to a high of 2 60 20 See also EditA Carinae 55 CancriReferences Edit a b c d e f 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 Gutierrez Moreno Adelina et al 1966 A System of photometric standards Publications of the Department of Astronomy University of Chile Publicaciones Universidad de Chile Department de Astronomy 1 1 17 Bibcode 1966PDAUC 1 1G a b c d e f g h Lyubimkov Leonid S et al February 2010 Accurate fundamental parameters for A F and G type Supergiants in the solar neighbourhood Monthly Notices of the Royal Astronomical Society 402 2 1369 1379 arXiv 0911 1335 Bibcode 2010MNRAS 402 1369L doi 10 1111 j 1365 2966 2009 15979 x S2CID 119096173 a b HR 4786 database entry The Bright Star Catalogue 5th Revised Ed Preliminary Version D Hoffleit and W H Warren Jr CDS ID V 50 Accessed on line September 9 2008 Evans D S June 20 24 1966 Batten Alan Henry Heard John Frederick eds The Revision of the General Catalogue of Radial Velocities Determination of Radial Velocities and Their Applications Proceedings from IAU Symposium No 30 University of Toronto International Astronomical Union 30 57 Bibcode 1967IAUS 30 57E a b c Takeda Yoichi Sato Bun ei Murata Daisuke August 2008 Stellar Parameters and Elemental Abundances of Late G Giants Publications of the Astronomical Society of Japan 60 4 781 802 arXiv 0805 2434 Bibcode 2008PASJ 60 781T doi 10 1093 pasj 60 4 781 S2CID 16258166 a b 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 a b Mallik Sushma V December 1999 Lithium abundance and mass Astronomy and Astrophysics 352 495 507 Bibcode 1999A amp A 352 495M Bernacca P L Perinotto M 1970 A catalogue of stellar rotational velocities Contributi Osservatorio Astronomico di Padova in Asiago 239 1 1 Bibcode 1970CoAsi 239 1B SV ZI 946 Variable Star database entry SIMBAD Accessed on line September 9 2008 a b Naming Stars IAU org Retrieved 18 June 2018 Kunitzch Paul Smart Tim 2006 1986 A Dictionary of Modern Star Names A Short Guide to 254 Star Names and Their Derivations Cambridge Massachusetts Sky Publishing Corporation p 62 ISBN 978 1 931559 44 7 a b Kaler James B KRAZ Beta Corvi Stars University of Illinois retrieved 2012 12 28 Falkner David E 2011 The Mythology of the Night Sky An Amateur Astronomer s Guide to the Ancient Greek and Roman Legends Patrick Moore s Practical Astronomy Springer p 81 ISBN 978 1 4614 0136 0 IAU Working Group on Star Names WGSN Retrieved 22 May 2016 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 2011 01 29 at the Wayback Machine Hong Kong Space Museum Accessed on line November 23 2010 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 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 44 7 3 30 AU 0 0046491 AU R 32 R displaystyle begin aligned 2 cdot R amp frac 10 3 cdot 44 7 cdot 3 30 text AU 0 0046491 text AU R bigodot amp approx 32 cdot R bigodot end aligned nbsp Kukarkin B V et al 1981 Nachrichtenblatt der Vereinigung der Sternfreunde e V Catalogue of suspected variable stars Nachrichtenblatt der Vereinigung der Sternfreunde Moscow Academy of Sciences USSR Shternberg Bibcode 1981NVS C 0K Retrieved from https en wikipedia org w index php title Beta Corvi amp oldid 1155316521, wikipedia, wiki, book, books, library,

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