Zeta Corvi
| |
| 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 |
| Distance | 420 ± 10 ly (127 ± 4 pc) |
| Details | |
| Luminosity | 154 L☉ |
| Temperature | 10695 K |
| Rotational velocity (v sin i) | 195[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Corvi (ζ Crv, 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.[5] 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.[6]
References
- 1 2 3 4 5 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357. - 1 2 "zet+Crv". SIMBAD. Centre de données astronomiques de Strasbourg.
- 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. Bibcode:2005AJ....129..809S. arXiv:astro-ph/0410337 . doi:10.1086/426748.
- 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
- ↑ 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. Bibcode:2012MNRAS.427..343M. arXiv:1208.2037 . doi:10.1111/j.1365-2966.2012.21873.x.
- ↑ Kaler, James B. (Jim) (26 April 2013), "Zeta Corvi", Stars, University of Illinois, retrieved 18 March 2015