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BO Carinae

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BO Carinae

BO Carinae is the brightest red star, towards upper left, in this image of theCarina Nebula.
Credit:ESO
Observation data
EpochJ2000EquinoxJ2000
Constellation Carina
Right ascension 10h46m00.53s
Declination 59° 29′ 19.5″
Apparent magnitude(V) 7.18 - 8.50[1]
Characteristics
Spectral type M4 Ib[1]
Variable type Lc[1]
Astrometry
Proper motion(μ)RA:−7.334±0.027[2]mas/yr
Dec.:−1.420±0.028[2]mas/yr
Parallax(π)0.6020 ± 0.0259mas[2]
Distance5,400 ± 200ly
(1,660 ± 70pc)
Absolute magnitude(MV)–5.53[3]
Details
Radius790[3]R☉
Luminosity78,000[3]L☉
Temperature3,525[3]K
Other designations
BO Car, IDS 10419-5858, IRAS 10438-5913, 2MASS J10455065-5929193, AAVSO 1042-58, SAO 238447, CD-58 3547, HD 93420
Database references
SIMBADdata

BO Carinae,also known asHD 93420,is anirregular variablestar in theconstellationCarina.

BO Car has a maximumapparent magnitudeof +7.18. Its distance and membership is uncertain, but its possible membership to the star clusterTrumpler 15allows a distance estimate of approximately2,500parsecs(8,150light-years).[4][5]TheGaia Data Release 2parallax of0.73±0.08massuggests a closer distance, but the value is considered unreliable due to excess astrometric noise.[6]

BO Car is ared supergiantofspectral typeM4Ib with aneffective temperatureof3,525K,a radius of790solar radii.Itsbolometric luminosityis 78,000L☉.[3]Mass-loss is on the order of0.3×10−9solar massesper year.[5]

AnI band(near infrared)light curvefor BO Carinae, plotted fromASASdata[7]

Billed as an irregular variable likeTZ CassiopeiaeorV528 Carinae;its apparent brightness fluctuates between magnitude +7.18 and +8.50 without clear periodicity.[1][8]Some observers have found BO Car not to be variable,[9]but more extensive studies find small amplitude variations with a possible period of 145 days.[10]

Multiple star catalogues list an 11th-magnitude star as a companion to BO Car. The separation was14.2″in 2015, and slowly increasing.[11]The companion is a distantblue giant.[12]

See also

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References

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  1. ^abcdSamus, 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. ^abcBrown, A. G. A.;et al. (Gaia collaboration) (2021)."GaiaEarly Data Release 3: Summary of the contents and survey properties ".Astronomy & Astrophysics.649:A1.arXiv:2012.01533.Bibcode:2021A&A...649A...1G.doi:10.1051/0004-6361/202039657.S2CID227254300.(Erratum:doi:10.1051/0004-6361/202039657e).Gaia EDR3 record for this sourceatVizieR.
  3. ^abcdeLevesque, 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/0504337.Bibcode:2005ApJ...628..973L.doi:10.1086/430901.S2CID15109583.
  4. ^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): 44–62.Bibcode:2003MNRAS.339...44T.doi:10.1046/j.1365-8711.2003.06186.x.hdl:11336/36798.
  5. ^abJosselin, 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.357:225–232.Bibcode:2000A&A...357..225J.
  6. ^Brown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
  7. ^"ASAS All Star Catalogue".The All Sky Automated Survey.Retrieved8 December2021.
  8. ^Chatys, Filip W.; Bedding, Timothy R.; Murphy, Simon J.; Kiss, László L.; Dobie, Dougal; Grindlay, Jonathan E. (2019)."The period-luminosity relation of red supergiants with Gaia DR2".Monthly Notices of the Royal Astronomical Society.487(4): 4832.arXiv:1906.03879.Bibcode:2019MNRAS.487.4832C.doi:10.1093/mnras/stz1584.S2CID182952598.
  9. ^Percy, John R.; Sato, Hiromitsu (2009-02-01). "Long Secondary Periods in Pulsating Red Supergiant Stars".Journal of the Royal Astronomical Society of Canada.103(1): 11.Bibcode:2009JRASC.103...11P.ISSN0035-872X.
  10. ^Percy, J. R. (2020). "Period Analysis of All-Sky Automated Survey for Supernovae (ASAS-SN) Data on a Sample of" Irregular "Pulsating Red Giants".Journal of the American Association of Variable Star Observers (Jaavso).48(1): 50.Bibcode:2020JAVSO..48...50P.
  11. ^Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog".The Astronomical Journal.122(6): 3466.Bibcode:2001AJ....122.3466M.doi:10.1086/323920.
  12. ^Brown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
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