V Coronae Borealis

V Coronae Borealis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 15h 49m 31.31093s [1]
Declination +39° 34′ 17.9111″ [1]
Spectral typeC6,2e(N2e)[2]
Other designations
HD 141826, HIP 77501

V Coronae Borealis (V CrB) is a Mira-type long period variable star and carbon star in the constellation Corona Borealis. Its apparent magnitude varies between 6.9 and 12.6 over a period of 357 days[2]

V Coronae Borealis is too far from earth for its parallax to be measured effectively; Guandalini and Cristallo calculated the luminosity of Mira variables based on their periods. Using a period of 357 days, they calculated the absolute magnitude of V Coronae Borealis to be -4.62.[3] It was estimated to around 8810 light-years distant in a 2012 paper, shining with a luminosity approximately 102831 times that of the Sun and has a surface temperature of 2877 K.[4]

References

  1. 1 2 "V Coronae Borealis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 13 November 2014.
  2. 1 2 VSX (4 January 2010). "V Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 13 November 2014.
  3. ↑ Guandalini, R.; Cristallo, S. (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics. 555: 7. arXiv:1305.4203Freely accessible. Bibcode:2013A&A...555A.120G. doi:10.1051/0004-6361/201321225. A120.
  4. ↑ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.


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