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Beta Corvi

From Wikipedia, the free encyclopedia
Star in the constellation of Corvus
β Corvi
Location of β Corvi (circled in red)
Observation data
EpochJ2000.0      EquinoxJ2000.0 (ICRS)
ConstellationCorvus
Right ascension12h 34m 23.23484s[1]
Declination−23° 23′ 48.3374″[1]
Apparent magnitude (V)2.647[2]
Characteristics
Spectral typeG5 II[3]
U−Bcolor index+0.586[2]
B−Vcolor index+0.898[2]
R−Icolor index+0.44[4]
Astrometry
Radial velocity (Rv)−7.34±0.08[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)−0.651±0.033[6]
Details
Mass3.32±0.06[5] M☉
Radius15.84±0.72[7] R☉
Luminosity175+13
−12[6] L☉
Surface gravity (log g)2.86±0.06[7] cgs
Temperature5325±28[6] K
Metallicity [Fe/H]0.14±0.02[6] dex
Rotational velocity (v sin i)2.58±0.55[5] km/s
Age280±10[5] 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][8]
Database references
SIMBADdata

Beta Corvi orβ Corvi, officially namedKraz (/ˈkræz/),[9] is the second-brighteststar in the southernconstellation ofCorvus with anapparent visual magnitude of 2.647.[2] Based onparallax measurements obtained during theHipparcos mission, it is about 146light-years (45parsecs) distant from theSun.[1]

Nomenclature

[edit]

β Corvi (Latinised toBeta Corvi) is the star'sBayer designation.

In a 1951 publication,Atlas Coeli (Skalnate Pleso Atlas of the Heavens) by Czech astronomerAntonín Bečvář, it bore the nameKraz, whose origin and meaning remain unknown.[10][11][12]

In 2016, the IAU organized aWorking Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN approved the nameKraz for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[9]

In Chinese,軫宿 (Zhěn Sù), meaningChariot (asterism), refers to anasterism consisting of Beta,Gamma,Epsilon andDelta Corvi.[14] Consequently, Beta Corvi itself is known as軫宿四 (Zhěn Sù sì, English:the Fourth Star of Chariot).[15]

Properties

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Beta Corvi has about 3.3 times theSun's mass and is roughly 300 million years old,[5] which is old enough for a star of this mass to consume the hydrogen at its core and evolve away from themain sequence. Thestellar classification is G5 II,[3] with the luminosity class of 'II' indicating this is abright giant. Theeffective temperature of the star's outer envelope is about 5,325 K,[6] which produces a yellow hue common toG-type stars.[16]

Currently, Beta Corvi has expanded to 15.8[7] times the Sun's size and is emitting about 175 times theluminosity of the Sun. The abundance of elements other than hydrogen or helium, what astronomers termmetallicity, is 1.38 times that of the Sun.[6][a]

This is avariable star that ranges inapparent visual magnitude from a low of 2.66 to a high of 2.60.[17]

See also

[edit]

Notes

[edit]
  1. ^The abundance is estimated by taking [Fe/H] to the power of ten:
              10[Fe/H] = 10+0.14 = 1.38

References

[edit]
  1. ^abcdefvan 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. ^abcdGutierrez-Moreno, Adelina; et al. (1966). "A System of photometric standards".Publications of the Department of Astronomy University of Chile.1. Publicaciones Universidad de Chile, Department de Astronomy:1–17.Bibcode:1966PDAUC...1....1G.
  3. ^abLyubimkov, 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. ^abHR 4786, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr.,CDS IDV/50. Accessed on line September 9, 2008.
  5. ^abcdeJofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015-02-01). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets".Astronomy and Astrophysics.574: A50.arXiv:1410.6422.Bibcode:2015A&A...574A..50J.doi:10.1051/0004-6361/201424474.ISSN 0004-6361.Beta Corvi's database entry atVizieR.
  6. ^abcdefRosas-Portilla, F.; Schröder, K.-P.; Jack, D. (2022-04-26)."On the physical nature of the Wilson-Bappu effect: revising the gravity and temperature dependence".Monthly Notices of the Royal Astronomical Society.513 (1):906–924.arXiv:2203.16593.Bibcode:2022csss.confE.216R.doi:10.1093/mnras/stac929.ISSN 0035-8711.
  7. ^abcGomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (2021-02-01)."Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity".Astronomy and Astrophysics.646: A77.arXiv:2012.10199.Bibcode:2021A&A...646A..77G.doi:10.1051/0004-6361/202039765.ISSN 0004-6361.Beta Corvi's database entry atVizieR.
  8. ^SV* ZI 946 -- Variable Star, database entry,SIMBAD. Accessed on line September 9, 2008.
  9. ^ab"Naming Stars". IAU.org. Retrieved18 June 2018.
  10. ^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.
  11. ^Kaler, James B.,"KRAZ (Beta Corvi)",Stars,University of Illinois, retrieved2012-12-28
  12. ^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
  13. ^"IAU Working Group on Star Names (WGSN)". Retrieved22 May 2016.
  14. ^(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.
  15. ^(in Chinese)香港太空館 - 研究資源 - 亮星中英對照表Archived 2011-01-29 at theWayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  16. ^"The Colour of Stars",Australia Telescope, Outreach and Education,Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived fromthe original on 2012-03-18, retrieved2012-01-16
  17. ^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
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