Astronomy:13 Comae Berenices

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Short description: Star system in the constellation Coma Berenices
13 Comae Berenices
Observation data
Equinox J2000.0]] (ICRS)
Constellation Coma Berenices
Right ascension  12h 24m 18.54890s[1]
Declination +26° 05′ 54.9214″[1]
Apparent magnitude (V) 5.15 – 5.18[2]
Characteristics
Evolutionary stage main sequence[1]
Spectral type A3 V[3][4]
B−V color index 0.082±0.003[4]
Variable type α2 CVn[2]
Astrometry
Radial velocity (Rv)+0.1±0.1[5] km/s
Proper motion (μ) RA: −26.158[1] mas/yr
Dec.: −9.385[1] mas/yr
Parallax (π)11.1318 ± 0.1589[1] mas
Distance293 ± 4 ly
(90 ± 1 pc)
Absolute magnitude (MV)0.38[4]
Orbit[6]
Period (P)27.25±1.76 yr
Semi-major axis (a)0.170±0.012″
Eccentricity (e)0.868±0.021
Inclination (i)32.3±7.3°
Longitude of the node (Ω)164.0±8.2°
Periastron epoch (T)2017.80±0.11
Argument of periastron (ω)
(secondary)		275.1±7.1°
Details
Mass2.83[7] M☉
Radius3.37[8] R☉
Luminosity55[8] L☉
Surface gravity (log g)3.84±0.14[7] cgs
Temperature8,846±301[7] K
Metallicity [Fe/H]0.24[4] dex
Rotation29.5 days[9]
Rotational velocity (v sin i)48[7] km/s
Age429[7] Myr
Other designations
13 Com, GN Com, BD+26° 2344, HD 107966, HIP 60514, HR 4717, SAO 82291[10]
Database references
SIMBADdata

13 Comae Berenices is a binary star[3] system in the northern constellation of Coma Berenices. It has an apparent visual magnitude of 5.2, which is bright enough to be faintly visible to the naked eye. With an annual parallax shift of 11.1 mas,[1] it is located around 293 light years from the Sun. It is member of the nearby Coma Star Cluster (Melotte 111).[11]

The two stars of this system orbit with a period of 27.25 years and a large eccentricity of 0.868.[6] The primary is an A-type main-sequence star with a stellar classification of A3 V.[3] In 1965, Gerhard Jackisch discovered the star is a variable star.[12] It was given its variable star designation, GN Comae Berenices, in 1975.[13] It is catalogued as an Alpha2 Canum Venaticorum variable.[14] Rensom (1990) listed it as a suspected Am star.[15] The system is a source of X-ray emission, which may be coming from the companion.[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  3. ↑ 3.0 3.1 3.2 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. 
  4. ↑ 4.0 4.1 4.2 4.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  5. ↑ 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. 
  6. ↑ 6.0 6.1 Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A.; Costa, Edgardo (July 2024), "Speckle Interferometry at SOAR Telescope in 2023" (in en), The Astronomical Journal 168 (1): 28, doi:10.3847/1538-3881/ad4d56, ISSN 0004-6256, Bibcode: 2024AJ....168...28T .
  7. ↑ 7.0 7.1 7.2 7.3 7.4 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. 
  8. ↑ 8.0 8.1 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  9. ↑ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G. et al. (2018). "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey". The Astronomical Journal 155 (1): 39. doi:10.3847/1538-3881/aa9bf4. Bibcode: 2018AJ....155...39O. 
  10. ↑ "13 Com". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=13+Com. 
  11. ↑ 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. 
  12. ↑ Jackisch, G. (September 1972). "Über die Veränderlichkeit der Sterne des Spektraltyps A". Astronomische Nachrichten 294 (1–2): 1–8. doi:10.1002/asna.19722940102. Bibcode: 1972AN....294....1J. 
  13. ↑ 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. 
  14. ↑ 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.
  15. ↑ 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. 
  16. ↑ 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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