V Coronae Borealis
V Coronae Borealis in optical light | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 15h 49m 31.31093s[1] |
| Declination | +39° 34′ 17.9111″[1] |
| Apparent magnitude (V) | 6.90[1] |
| Characteristics | |
| Spectral type | C6,2e(N2e)[2] |
| Astrometry | |
| Distance | 630 pc[3] |
| Details[3] | |
| Radius | 750[a] R☉ |
| Luminosity | 5300 L☉ |
| Temperature | 1800 K |
| Database references | |
| SIMBAD | data |
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. Basing on a period of 357 days, the absolute magnitude of V Coronae Borealis has been calculated to be -4.62.[5] It is estimated to be 630 pc (2,100 ly) from Earth, has a luminosity of 5,300 L☉ and a rather cool effective temperature of 1,800 K, these implying a very large radius of about 750 R☉, 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.
Notes
[edit]- ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
References
[edit]- ^ a b c "V Coronae Borealis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 13 November 2014.
- ^ a b VSX (4 January 2010). "V Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 13 November 2014.
- ^ a b c 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.
- ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ 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.
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