Beta Canis Majoris

Beta Canis Majoris
Diagram showing star positions and boundaries of the Canis Major constellation and its surroundings
Location of β Canis Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension  06h 22m 41.98535s
Declination −17° 57′ 21.3073″
Apparent magnitude (V) 1.985 (1.97 - 2.01)
Characteristics
Spectral type B1 II-III
U−B color index −0.99
B−V color index −0.235
Variable type β Cep
Astrometry
Radial velocity (Rv)+33.7 km/s
Proper motion (μ) RA: −3.23 mas/yr
Dec.: −0.78 mas/yr
Parallax (π)6.62 ± 0.22 mas
Distance490 ± 20 ly
(151 ± 5 pc)
Absolute magnitude (MV)−4.1
Details
Mass12 or 12.6 M☉
Radius7.4 or 8.2 R☉
Luminosity25,700+3,800
−3,300 L☉
Surface gravity (log g)3.78±0.08 cgs
Temperature24,700±300 K
Metallicity [Fe/H]0.04 ± 0.10 dex
Rotation13.6±1.2 days
Rotational velocity (v sin i)31 ± 5 km/s
Age12.2 or 13.8 Myr
Other designations
Mirzam, Murzim, Mirza, 2 Canis Majoris, HR 2294, BD−17°1467, HD 44743, SAO 151428, FK5 243, HIP 30324, GC 8223, CCDM 06227-1757
Database references
SIMBADdata

Beta Canis Majoris, also called Mirzam, is a star in the southern constellation of Canis Major, the "Great Dog". It is around 500 light-years (150 parsecs) from the Sun. In the constellation it looks like it is in the dog's front leg.

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (November 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
  2. 1 2 3 Cousins, A. W. J. (1972), "UBV Photometry of Some Very Bright Stars", Monthly Notes of the Astronomical Society of Southern Africa, 31: 69, Bibcode:1972MNSSA..31...69C
  3. ↑ Balona, L. A.; Bregman, L.; Letsapa, B. A.; Magoro, B. T.; Walsh, S. E. (1996). "The Pulsation Frequencies of beta CMa". Information Bulletin on Variable Stars. 4313: 1. Bibcode:1996IBVS.4313....1B.
  4. ↑ Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590
  5. ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: 02025. Bibcode:2009yCat....102025S.
  6. ↑ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Washington, Bibcode:1953GCRV..C......0W
  7. ↑ Shobbrook, R. R.; Handler, G.; Lorenz, D.; Mogorosi, D. (2006). "Photometric studies of three multiperiodic β Cephei stars: β CMa, 15 CMa and KZ Mus". Monthly Notices of the Royal Astronomical Society. 369 (1): 171–181. arXiv:astro-ph/0603754. Bibcode:2006MNRAS.369..171S. doi:10.1111/j.1365-2966.2006.10289.x. S2CID 18593836.
  8. 1 2 3 4 5 Fossati, L.; Castro, N.; Morel, T.; Langer, N.; Briquet, M.; Carroll, T. A.; Hubrig, S.; Nieva, M. F.; Oskinova, L. M.; Przybilla, N.; Schneider, F. R. N.; Schöller, M.; Simón-Díaz, S.; Ilyin, I.; de Koter, A. (2015-02-01). "B fields in OB stars (BOB): on the detection of weak magnetic fields in the two early B-type stars β CMa and ɛ CMa. Possible lack of a "magnetic desert" in massive stars". Astronomy and Astrophysics. 574: A20. arXiv:1411.6490. Bibcode:2015A&A...574A..20F. doi:10.1051/0004-6361/201424986. ISSN 0004-6361.
  9. 1 2 Shultz, M. E.; Wade, G. A.; Rivinius, Th; Alecian, E.; Neiner, C.; Petit, V.; Wisniewski, J. P.; MiMeS Collaboration; BinaMIcS Collaboration (2019), "The magnetic early B-type Stars II: Stellar atmospheric parameters in the era of Gaia", Monthly Notices of the Royal Astronomical Society, 485 (2): 1508, arXiv:1902.02713, Bibcode:2019MNRAS.485.1508S, doi:10.1093/mnras/stz416, S2CID 119463660
  10. 1 2 Mazumdar, A.; et al. (November 2006), "An asteroseismic study of the β Cephei star β Canis Majoris", Astronomy and Astrophysics, 459 (2): 589–596, arXiv:astro-ph/0607261, Bibcode:2006A&A...459..589M, doi:10.1051/0004-6361:20064980, S2CID 11807580
  11. ↑ Allen, Richard Hinckley (1899), "Star-names and their meanings", New York: 129–130, Bibcode:1899sntm.book.....A
  12. ↑ "V* bet CMa -- Variable Star of beta Cep type", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-02
  13. ↑ "IAU Catalog of Star Names". Retrieved 28 July 2016.