31_Comae_Berenices

31 Comae Berenices

31 Comae Berenices

Star in the constellation Coma Berenices

31 Comae Berenices (31 Com) is a yellow giant star in the constellation Coma Berenices. Its apparent magnitude is about 4.9 and slightly variable. It is a rare FK Comae Berenices variable, a variable star that spins rapidly and has large starspots on its surface.[5] It is currently in the Hertzsprung gap and its outer envelope has just begun convection.[3] In 1989 it was given as a spectral standard for the class G0IIIp.[6]

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

31 Com is the north galactic pole star, and occasionally goes by the informal name Polaris Galacticum Borealis, coined by Jim Kaler.[7]

In Chinese astronomy, 31 Comae Berenices is called 郎將, Pinyin: Lángjiāng, meaning Captain of the Bodyguards, because this star is marking itself and stand alone in Captain of the Bodyguards asterism, Supreme Palace enclosure mansion (see : Chinese constellation).[8]

References

  1. [1]
    Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. [2]
    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, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  3. [3]
    Strassmeier, K. G.; et al. (September 2010), "Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae", Astronomy and Astrophysics, 520: 14, Bibcode:2010A&A...520A..52S, doi:10.1051/0004-6361/201015023, A52.
  4. [4]
    Aurière, M.; et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: 30, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, S2CID 118504829, A90.
  5. [5]
    "31 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 13, 2018.
  6. [6]
    Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373
  7. [7]
    "Polaris Galacticum Borealis". Retrieved 2015-12-02.
  8. [8]
    Ian Ridpath's Startales - Coma Berenices the Berenice's Hair
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