Zeta Corvi

Zeta Corvi
The location of Zeta Corvi (ζ) in the constellation of Corvus (shown as a red target's bullseye).
Observation data
Epoch J2000.0      Equinox J2000.0
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[2] 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[5]
Details
Luminosity191[5] L☉
Temperature10695 K
Rotational velocity (v sin i)195[3] km/s
Other designations
5 Corvi, ζ Crv, ζ Corvi, BD–21° 3514, HD 107348, HIP 60189, HR 4696, SAO 180700
Database references
SIMBADdata

Zeta Corvi, Latinized from ζ Corvi, is a star in the constellation Corvus. It is a blue-white main sequence star of apparent magnitude 5.21. Located 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.[6] 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 arcseconds 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.[7]

References

  1. 1 2 3 4 5 van Leeuwen, F.; et al. (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.
  2. 1 2 "zet+Crv". SIMBAD. Centre de données astronomiques de Strasbourg.
  3. 1 2 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. arXiv:astro-ph/0410337. Bibcode:2005AJ....129..809S. doi:10.1086/426748.
  4. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
  5. 1 2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  6. ↑ 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. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  7. ↑ Kaler, James B. (Jim) (26 April 2013), "Zeta Corvi", Stars, University of Illinois, retrieved 18 March 2015
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