Astronomy:Zeta Corvi

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Short description: Star in the constellation Corvus
ζ Corvi
Location of ζ Corvi (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Corvus
Right ascension  12h 20m 33.64200s[1]
Declination −22° 12′ 57.2410″[1]
Apparent magnitude (V) 5.21[2]
Characteristics
Evolutionary stage Be star
Spectral type B8V[3]
U−B color index −0.39[4]
B−V color index −0.11[4]
Astrometry
Radial velocity (Rv)−6.40±4.2[5] km/s
Proper motion (μ) RA: −108.97[1] mas/yr
Dec.: −27.31[1] mas/yr
Parallax (π)7.85 ± 0.22[1] mas
Distance420 ± 10 ly
(127 ± 4 pc)
Absolute magnitude (MV)−0.32[6]
Details
Mass3.39±0.04[7] M☉
Radius4.57±0.09[8] R☉
Luminosity200[7] L☉
Surface gravity (log g)2.26±0.02[8] cgs
Temperature11,561[7] K
Rotational velocity (v sin i)259[7] km/s
Other designations
ζ Crv, 5 Crv, BD−21°3514, HD 107348, HIP 60189, HR 4696, SAO 180700[9]
Database references
SIMBADdata

Zeta Corvi, Latinised from ζ Corvi, is a star in the constellation Corvus. It is a blue-white main-sequence star of apparent magnitude 5.21. Around 420 light-years distant, it shines with a luminosity approximately 154 times that of the Sun and has a surface temperature of 10,695 K.[10] It is a Be star, the presence of hydrogen emission lines in its spectrum indicating it has a circumstellar disk. It is separated by 7 arcminutes from the star HR 4691. The two may be an optical double or a true multiple star system, with a separation of at least 50,000 astronomical units and the stars taking 3.5 million years to orbit each other. HR 4691 is itself double, composed of an ageing yellow-orange giant whose spectral type has been calculated at K0 or G3, and an F-type main-sequence star.[11]

In Chinese astronomy, this star is named Changsha (simplified Chinese: 长沙; traditional Chinese: 長沙). This was translated by R. H. Allen as "a Long Sand-bank",[12] but according to Ian Ridpath it represents a coffin.[13] Changsha is the capital of Hunan province in China.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  2. ↑ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". Vizier Online Data Catalog 2237. Bibcode: 2002yCat.2237....0D. 
  3. ↑ Strom, Stephen E.; Wolff, Sidney C.; Dror, David H. A. (2005). "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?". The Astronomical Journal 129 (2): 809–828. doi:10.1086/426748. Bibcode: 2005AJ....129..809S. 
  4. ↑ 4.0 4.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data., 0 (1986): 0. Bibcode: 1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1. 
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  6. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 7.3 Zorec, J.; Royer, F.; Dror, David (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  8. ↑ 8.0 8.1 Arcos, C.; Kanaan, S.; Chávez, J.; Vanzi, L.; Araya, I.; Curé, M. (2018). "Stellar parameters and H α line profile variability of be stars in the BeSOS survey". Monthly Notices of the Royal Astronomical Society 474 (4): 5287. doi:10.1093/mnras/stx3075. Bibcode: 2018MNRAS.474.5287A. 
  9. ↑ "zet Crv". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=zet+Crv. 
  10. ↑ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M. 
  11. ↑ Kaler, James B. (Jim) (26 April 2013). "Zeta Corvi". Stars. University of Illinois. http://stars.astro.illinois.edu/sow/zetacrv.html. 
  12. ↑ Allen, R. H. (1899), Star Names: Their Lore and Meaning, p. 182, https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Corvus*.html 
  13. ↑ Ridpath, Ian. "Star Tales - Corvus and Crater". http://ianridpath.com/startales/corvusandcrater.html. 



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