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13 Comae Berenices 
Summary
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]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| 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 mas[1] |
| 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 |
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 edit
- ^ a b c d e f van Leeuwen, F. (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.
- ^ a b c d e f g 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.
- ^ a b c d 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c d e 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ "13 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-17.
- ^ 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, arXiv:astro-ph/0510133, Bibcode:2006MNRAS.365..447C, doi:10.1111/j.1365-2966.2005.09689.x, S2CID 17595520.
- ^ 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)", Bulletin d'Information du Centre de Données Stellaires (in French), 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, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.