13 Comae Berenices

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]

13 Comae Berenices
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[1] mas
Distance260 ± 20 ly
(81 ± 7 pc)
Absolute magnitude (MV)0.38[2]
Details
Mass2.83[5] M☉
Luminosity60.93[2] L☉
Surface gravity (log g)3.84±0.14[5] cgs
Temperature8,846±301[5] K
Metallicity [Fe/H]0.24[2] dex
Rotational velocity (v sin i)48[5] km/s
Age429[5] Myr
Other designations
13 Com, GN Com, BD+26° 2344, HD 107966, HIP 60514, HR 4717, SAO 82291[6]
Database references
SIMBADdata

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. 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.
  2. 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.
  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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  4. 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, A61.
  5. 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.
  6. "13 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-17.
  7. 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.
  8. 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. }}
  9. 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.
  10. 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.
  11. 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.
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