13 Comae Berenices

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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
Distance 260 ± 20 ly
(81 ± 7 pc)
Absolute magnitude (MV) 5.17[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
13 Com, GN Com, BD+26° 2344, HD 107966, HIP 60514, HR 4717, SAO 82291[6]
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[edit]

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e f g Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  3. ^ 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:0806.2878Freely accessible, 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:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ 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:1501.03154Freely accessible, 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/0510133Freely accessible, 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 Donnees 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 Donnees 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.