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.[1]
Based on a period of 357 days, the absolute magnitude of V Coronae Borealis has been calculated to be -4.62.[2] It is estimated to be 880 parsecs (2,900 light-years) from Earth based on parallax, has a luminosity of and a rather cool effective temperature of 1,800 K, these implying a very large radius of about , making V Coronae Borealis one of the largest stars so far discovered.[3] If placed in the center of the Solar System, its size would engulf all rocky planets and reach parts of the asteroid belt.
References
- ^ VSX (4 January 2010). "V Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 13 November 2014.
- ^ Guandalini, R. & Cristallo, S. (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics. 555: 7. arXiv:1305.4203. Bibcode:2013A&A...555A.120G. doi:10.1051/0004-6361/201321225. S2CID 54918450. A120.
- ^ Danilovich, T.; Teyssier, D.; Justtanont, K.; Olofsson, H.; Cerrigone, L.; Bujarrabal, V.; Alcolea, J.; Cernicharo, J.; Castro-Carrizo, A.; García-Lario, P.; Marston, A. (2015-09-01). "New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme". Astronomy and Astrophysics. 581: A60. arXiv:1506.09065. Bibcode:2015A&A...581A..60D. doi:10.1051/0004-6361/201526705. ISSN 0004-6361