| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12 24 18.52125 |
| Declination | +26° 05′ 55.0346″ |
| Apparent magnitude (V) | 5.17 |
| Characteristics | |
| Spectral type | A3 V |
| B−V color index | 0.082±0.003 |
| Astrometry | |
| Radial velocity (Rv) | +0.1±0.1 km/s |
| Proper motion (μ) | RA: −28.29 mas/yr Dec.: +3.07 mas/yr |
| Parallax (π) | 12.33 ± 1.11 mas |
| Distance | 260 ± 20 ly (81 ± 7 pc) |
| Absolute magnitude (MV) | 0.38 |
| Details | |
| Mass | 2.83 M☉ |
| Luminosity | 60.93 L☉ |
| Surface gravity (log g) | 3.84±0.14 cgs |
| Temperature | 8,846±301 K |
| Metallicity | 0.24 dex |
| Rotational velocity (v sin i) | 48 km/s |
| Age | 429 Myr |
| Other designations | |
| 13 Com, GN Com, BD+26° 2344, HD 107966, HIP 60514, HR 4717, SAO 82291 | |
| Database references | |
| SIMBAD | data |
13 Comae Berenices is a probable binary star system in the northern constellation of Coma Berenices. It has an apparent visual magnitude of 5.17, which is bright enough to be faintly visible to the naked eye. With an annual parallax shift of 12.33 mas, it is located around 260 light years from the Sun. It is member of the nearby Coma Star Cluster (Melotte 111).
Based on measured changes in the star's motion, this is most likely an astrometric binary system. The visible component is an A-type main-sequence star with a stellar classification of A3 V. In 1965, Gerhard Jackisch discovered the star is a variable star. It was given its variable star designation, GN Comae Berenices, in 1975. It is catalogued as an Alpha Canum Venaticorum variable. Rensom (1990) listed it as a suspected Am star. The system is a source of X-ray emission, which may be coming from the companion.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- Jackisch, G. (September 1972). "Über die Veränderlichkeit der Sterne des Spektraltyps A". Astronomische Nachrichten. 294: 1–8. Bibcode:1972AN....294....1J. doi:10.1002/asna.19722940102. Retrieved 29 January 2025.
- 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.
- 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.
- 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.
