Zeta Corvi

ζ Corvi

Location of ζ Corvi (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Corvus
Right ascension	12^h 20^m 33.64200^s[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 mas[1]
Distance	420 ± 10 ly (127 ± 4 pc)
Absolute magnitude (MV)	−0.32[5]
Details
Mass	3.39±0.04[6] M☉
Radius	4.57±0.09[7] R☉
Luminosity	200[6] L☉
Surface gravity (log g)	2.26±0.02[7] cgs
Temperature	11,561[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
SIMBAD	data

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]

References

1. 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. "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. 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 "Compilation of Eggen's UBV data, transformed to UBV (unpublished)".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. 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. 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