Wikipedia

Beta Canis Majoris

Beta Canis Majoris, also called Mirzam,[13] is a star in the southern constellation of Canis Major, the "Great Dog". It is around 500 light-years (150 parsecs) from the Sun.[1] In the constellation it looks like it is in the dog's front leg.

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[1]
Declination −17° 57′ 21.3073″[1]
Apparent magnitude (V) 1.985[2] (1.97 - 2.01[3])
Characteristics
Spectral type B1 II-III[4]
U−B color index −0.99[2]
B−V color index −0.235[2]
Variable type β Cep[5]
Astrometry
Radial velocity (Rv)+33.7[6] km/s
Proper motion (μ) RA: −3.23[1] mas/yr
Dec.: −0.78[1] mas/yr
Parallax (π)6.62 ± 0.22[1] mas
Distance490 ± 20 ly
(151 ± 5 pc)
Absolute magnitude (MV)−4.1[7]
Details
Mass12 or 12.6[8] M☉
Radius7.4 or 8.2[8] R☉
Luminosity25,700+3,800
−3,300[9] L☉
Surface gravity (log g)3.78±0.08[8] cgs
Temperature24,700±300[9] K
Metallicity [Fe/H]0.04 ± 0.10[10] dex
Rotation13.6±1.2[8] days
Rotational velocity (v sin i)31 ± 5[10] km/s
Age12.2 or 13.8[8] Myr
Other designations
Mirzam, Murzim, Mirza,[11] 2 Canis Majoris, HR 2294, BD−17°1467, HD 44743, SAO 151428, FK5 243, HIP 30324, GC 8223, CCDM 06227-1757[12]
Database references
SIMBADdata

References

change
  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. ↑ 2.0 2.1 2.2 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. ↑ 8.0 8.1 8.2 8.3 8.4 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. ↑ 9.0 9.1 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. ↑ 10.0 10.1 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.
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