From Wikipedia, the free encyclopedia
ζ Corvi
Corvus constellation map.svg
Red circle.svg
Location of ζ Corvi (circled)
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]
Evolutionary stage Be star
Spectral type B8V [3]
U−B color index −0.39 [4]
B−V color index −0.11 [4]
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  mas [1]
Distance420 ± 10  ly
(127 ± 4  pc)
Absolute magnitude (MV)−0.32 [5]
Mass3.39±0.04 [6]  M
Radius4.57±0.09 [7]  R
Luminosity200 [6]  L
Surface gravity (log g)2.26±0.02 [7]  cgs
Temperature11,561 [6]  K
Rotational velocity (v sin i)259 [6] km/s
Other designations
5 Corvi, ζ Crv, ζ Corvi, BD–21° 3514, HD 107348, HIP 60189, HR 4696, SAO 180700
Database references

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. [8] 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. [9]


  1. ^ a b c d e 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. S2CID  18759600.
  2. ^ a b "zet+Crv". SIMBAD. Centre de données astronomiques de Strasbourg.
  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. arXiv: astro-ph/0410337. Bibcode: 2005AJ....129..809S. doi: 10.1086/426748. S2CID  15059129.
  4. ^ a b 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 "Compilation of Eggen's UBV data, transformed to UBV (unpublished)".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.
  5. ^ 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, S2CID  119257644.
  6. ^ a b c d Zorec, J.; Royer, F.; Dror, David (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv: 1201.2052. Bibcode: 2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691. S2CID  55586789.
  7. ^ a b 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. arXiv: 1711.08675. Bibcode: 2018MNRAS.474.5287A. doi: 10.1093/mnras/stx3075.
  8. ^ 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. S2CID  118665352.
  9. ^ Kaler, James B. (Jim) (26 April 2013), "Zeta Corvi", Stars, University of Illinois, retrieved 18 March 2015