V Coronae Borealis

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V Coronae Borealis
V Coronae Borealis.jpg
V Coronae Borealis in optical light
Observation data
Epoch J2000       Equinox J2000
Constellation Corona Borealis
Right ascension 15h 49m 31.31220s [1]
Declination +39° 34′ 17.8926″ [1]
Apparent magnitude  (V)6.9 - 12.6 [2]
Characteristics
Evolutionary stage AGB [3]
Spectral type C6,2e(N2e) [4]
Variable type Mira [2]
Astrometry
Proper motion (μ)RA: +5.905 mas/yr [1]
Dec.: −15.089 mas/yr [1]
Parallax (π)1.1378±0.0238  mas [1]
Distance 2,870 ± 60  ly
(880 ± 20  pc)
Details [5]
Radius 750 [a]   R☉
Luminosity 5,300  L☉
Temperature 1,800  K
Other designations
V CrB, BD+40 2929, HD 141826, HIP 77501, SAO 64929 [6]
Database references
SIMBAD data
The visual band light curve of V Coronae Borealis, from AAVSO data VCrBLightCurve.png
The visual band light curve of V Coronae Borealis, from AAVSO 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. [4]

Based on a period of 357 days, the absolute magnitude of V Coronae Borealis has been calculated to be -4.62. [8] It is estimated to be 880  pc (2,900  ly ) from Earth based on parallax, 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. [5] If placed in the center of the Solar System, its size would engulf all rocky planets and reach parts of the asteroid belt.

Notes

  1. ↑ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772  K :

References

  1. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  3. ↑ Hoai, Do Thi; Nhung, Pham Tuyet; Darriulat, Pierre; Tan, Mai Nhat (2025). "Stellar Evolution Along the Asymptotic Giant Branch as Revealed by the Shape of Miras' Visual Light Curves". The Astrophysical Journal. 982 (2): 201. arXiv: 2411.18044 . Bibcode:2025ApJ...982..201H. doi: 10.3847/1538-4357/adb8d9 .
  4. 1 2 VSX (4 January 2010). "V Coronae Borealis". AAVSO Website. American Association of Variable Star Observers . Retrieved 13 November 2014.
  5. 1 2 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.
  6. ↑ "V Coronae Borealis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 13 November 2014.
  7. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  8. ↑ 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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