BO Carinae

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BO Carinae
Carina Nebula by ESO.jpg
BO Carinae is the brightest red star, towards upper left, in this image of the Carina Nebula.
Credit: ESO
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
Proper motion (μ)RA: −7.334±0.027 [2]   mas/yr
Dec.: −1.420±0.028 [2]   mas/yr
Parallax (π)0.6020 ± 0.0259  mas [2]
Distance 5,400 ± 200  ly
(1,660 ± 70  pc)
Absolute magnitude  (MV)–5.53 [3]
Details
Radius 790 [3]   R☉
Luminosity 78,000 [3]   L☉
Temperature 3,525 [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
SIMBAD data

BO Carinae, also known as HD 93420, is an irregular variable star in the constellation Carina.

BO Car 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 ). [4] [5] The Gaia Data Release 2 parallax of 0.73±0.08  mas suggests a closer distance, but the value is considered unreliable due to excess astrometric noise. [6]

BO Car is a red supergiant of spectral type M4Ib with an effective temperature of 3,525  K , a radius of 790  solar radii . Its bolometric luminosity is 78,000 L☉. [3] Mass-loss is on the order of 0.3×10−9  solar masses per year. [5]

An I band (near infrared) light curve for BO Carinae, plotted from ASAS data BOCarLightCurve.png
An I band (near infrared) light curve for BO Carinae, plotted from ASAS data

In 1919, William Matthew Worssell of the Union Observatory announced that the star, then known as CPD-58 2683, is a variable star. [8] It was given its variable star designation, BO Carinae, in 1921. [9] Billed as an irregular variable like TZ Cassiopeiae or V528 Carinae; its apparent brightness fluctuates between magnitude +7.18 and +8.50 without clear periodicity. [1] [10] Some observers have found BO Car not to be variable, [11] but more extensive studies find small amplitude variations with a possible period of 145 days. [12]

Multiple star catalogues list an 11th-magnitude star as a companion to BO Car. The separation was 14.2″ in 2015, and slowly increasing. [13] The companion is a distant blue giant. [14]

See also

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References

  1. 1 2 3 4 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 3 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early 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 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. 1 2 3 4 5 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/0504337 . Bibcode:2005ApJ...628..973L. doi:10.1086/430901. S2CID   15109583.
  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. 1 2 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: 225–232. Bibcode:2000A&A...357..225J.
  6. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data 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 source at VizieR .
  7. ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  8. ↑ Worssell, M. W. (1919). "Variable Stars". Circular of the Union Observatory Johannesburg. 46: 17. Retrieved 7 January 2025.
  9. ↑ Hartwig; Müller (January 1921). "Benennung von neu entdeckten veränderlichen Sternen". Astronomische Nachrichten. 212 (19): 353–374. doi:10.1002/asna.19202121902 . Retrieved 7 January 2025.
  10. ↑ 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 . S2CID   182952598.
  11. ↑ 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. ISSN   0035-872X.
  12. ↑ 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.
  13. ↑ 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 .
  14. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data 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 source at VizieR .
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