Astronomy:13 Comae Berenices
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Short description: Probable binary star system in the constellation Coma Berenices
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 24m 18.52125s[1] |
| Declination | +26° 05′ 55.0346″[1] |
| Apparent magnitude (V) | 5.17[2] |
| Characteristics | |
| Spectral type | A3 V[3][2] |
| B−V color index | 0.082±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | +0.1±0.1[4] km/s |
| Proper motion (μ) | RA: −28.29[1] mas/yr Dec.: +3.07[1] mas/yr |
| Parallax (π) | 12.33 ± 1.11[1] mas |
| Distance | 260 ± 20 ly (81 ± 7 pc) |
| Absolute magnitude (MV) | 0.38[2] |
| Details | |
| Mass | 2.83[5] M☉ |
| Luminosity | 60.93[2] L☉ |
| Surface gravity (log g) | 3.84±0.14[5] cgs |
| Temperature | 8,846±301[5] K |
| Metallicity [Fe/H] | 0.24[2] dex |
| Rotational velocity (v sin i) | 48[5] km/s |
| Age | 429[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
13 Comae Berenices is a probable binary star[3] system in the northern constellation of Coma Berenices. It has an apparent visual magnitude of 5.17,[2] which is bright enough to be faintly visible to the naked eye. With an annual parallax shift of 12.33 mas,[1] it is located around 260 light years from the Sun. It is member of the nearby Coma Star Cluster (Melotte 111).[7]
Based on measured changes in the star's motion, this is most likely an astrometric binary system.[3] The visible component is an A-type main-sequence star with a stellar classification of A3 V.[3] It is catalogued as an Alpha2 Canum Venaticorum variable[8] with the designation GN Com.[9] Rensom (1990) listed it as a suspected Am star.[10] The system is a source of X-ray emission, which may be coming from the companion.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 5.2 5.3 5.4 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ "13 Com". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=13+Com.
- ↑ Casewell, S. L. et al. (January 2006), "New stellar members of the Coma Berenices open star cluster", Monthly Notices of the Royal Astronomical Society 365 (2): 447–453, doi:10.1111/j.1365-2966.2005.09689.x, Bibcode: 2006MNRAS.365..447C.
- ↑ Hoffleit, D. (October 1982), "Variable stars in the General Catalogue of Trigonometric Parallaxes", Bulletin d'Information du Centre de Données Stellaires 23: 53, Bibcode: 1982BICDS..23...53H. See entry 2855.
- ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (January 1975), "60th Name-List of Variable Stars", Information Bulletin on Variable Stars 961: 1, Bibcode: 1975IBVS..961....1K.
- ↑ Renson, P. (December 1990), "Liste des étoiles Ap et Am dans les amas ouverts (Edition révisée)" (in French), Bulletin d'Information du Centre de Données Stellaires 38: 151, Bibcode: 1990BICDS..38..151R.
- ↑ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics 475 (2): 677−684, doi:10.1051/0004-6361:20077429, Bibcode: 2007A&A...475..677S.
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