BO Carinae

BO Carinae

Location of BO Car
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 46m 00.53s
Declination 59° 29′ 19.5″
Apparent magnitude (V) 7.18 - 8.50[1]
Characteristics
Spectral type M4 Ib[1]
Variable type Lc[1]
Astrometry
Distance2,500 ly
(8,150[2][3] pc)
Absolute magnitude (MV)−5.53
Details
Radius790[4] R☉
Luminosity78,000[4] L☉
Temperature3,525[4] K
Other designations
BO Car, Trumpler 16, IDS 10419-5858, IRAS 10438-5913, 2MASS J10455065-5929193, AAVSO 1042-58, SAO 238447, CD-58 3547, HD 93420
Database references
SIMBADdata

BO Carinae (BO Car / HD 93420 / SAO 238447) is a variable star in the constellation Carina.

Distance

BO Carinae is the brightest red star, towards upper left, in this image of the Carina Nebula. (ESO)

BO Carinae has a maximum apparent magnitude of +7.18. Its distance and membership is uncertain, but its possible membership to the star cluster Trumpler 15 allows a distance estimate of approximately 2,500 parsecs (8,150 light-years).[2][3]

Characteristic

BO Carinae is a red supergiant of spectral type M4Ib with an effective temperature of 3,525 K. It is one of largest stars with a radius of 790 solar radii. Its bolometric luminosity reaches 78,000 times solar.[4] Mass-loss is on the order of 0.3 × 10-9 solar masses per year.[3]

Billed as an irregular variable like TZ Cassiopeiae or V528 Carinae; its apparent brightness fluctuates between magnitude +7.18 and +8.50 without periodicity.

See also

Reference

  1. 1 2 3 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. Bibcode:2009yCat....102025S.
  2. 1 2 Tapia, Mauricio; Roth, Miguel; Vázquez, Rubén A.; Feinstein, Alejandro (2003). "Imaging study of NGC 3372, the Carina nebula - I. UBVRIJHK photometry of Tr 14, Tr 15, Tr 16 and Car I". Monthly Notices of the Royal Astronomical Society. 339 (1). pp. 44-62.
  3. 1 2 3 Josselin, E.; Blommaert, J. A. D. L.; Groenewegen, M. A. T.; Omont, A.; Li, F. L. (2000). "Observational investigation of mass loss of M supergiants". Astronomy and Astrophysics. 357. pp. 225-232.
  4. 1 2 3 4 Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (August 2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal. 628 (2): 973–985. arXiv:astro-ph/0504337Freely accessible. Bibcode:2005ApJ...628..973L. doi:10.1086/430901.


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