Astronomy:BC Canis Minoris

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Short description: Star in the constellation Canis Minor
BC Canis Minoris
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A visual band light curve for BC Canis Minoris, plotted from data presented by Tabur et al. (2009)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Canis Minor[2]
Right ascension  07h 52m 07.18978s[3]
Declination +03° 16′ 38.4369″[3]
Apparent magnitude (V) 6.30[2] (6.14 to 6.42)[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M4/5III[6]
B−V color index 1.464±0.015[2]
Variable type SRb[4]
Astrometry
Radial velocity (Rv)−66.91±0.24[2] km/s
Proper motion (μ) RA: +49.643[3] mas/yr
Dec.: −78.206[3] mas/yr
Parallax (π)5.7446 ± 0.0689[3] mas
Distance568 ± 7 ly
(174 ± 2 pc)
Absolute magnitude (MV)0.36[2]
Details
Mass2.2[7] M☉
Radius53[3] R☉
Luminosity559[3] L☉
Surface gravity (log g)1.82[7] cgs
Temperature3,980[7] K
Metallicity [Fe/H]−0.38[7] dex
Age2.5[3] Gyr
Other designations
BC CMi, BD+03°1824, HD 64052, HIP 38406, HR 3061, SAO 116054[8]
Database references
SIMBADdata

BC Canis Minoris is a variable star in the equatorial constellation of Canis Minor. It has a reddish hue and is just barely visible to the naked eye with an apparent visual magnitude that fluctuates around 6.30. The distance to this object is approximately 568 light years based on parallax, but it is drifting closer with a radial velocity of −67 km/s.

In 1962, Alan William James Cousins announced that HR 3061 is a variable star.[9] It was given its variable star designation, BC Canis Minoris, in 1975.[10] It is an aging red giant star currently on the asymptotic giant branch[5] with a stellar classification of M4/5III.[6] It is a semi-regular variable of subtype SRb[4] with measured pulsation periods of 27.7, 143.3 and 208.3 days, and an average visual magnitude of 6.30.[11] With the supply of hydrogen at its core exhausted, it has cooled and expanded off the main sequence and now has around 53 times the girth of the Sun.[3] On average, the star is radiating about 559 times the luminosity of the Sunfrom its swollen photosphere at an effective temperature of 3,980 K.[3]

References

  1. ↑ Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (December 2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society 400 (4): 1945–1961. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.0 4.1 4.2 Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  5. ↑ 5.0 5.1 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". Astronomical Journal 104 (1): 275–313. doi:10.1086/116239. Bibcode: 1992AJ....104..275E. 
  6. ↑ 6.0 6.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H. 
  7. ↑ 7.0 7.1 7.2 7.3 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  8. ↑ "BC CMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BC+CMi. 
  9. ↑ Cousins, A. W. J. (1963). "Photometric Data for Stars in the Equatorial Zone (Fourth List)". Monthly Notes of the Astron. Soc. Southern Africa 22: 58–62. Bibcode: 1963MNSSA..22...58C. https://articles.adsabs.harvard.edu/pdf/1963MNSSA..22...58C. Retrieved 9 December 2024. 
  10. ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (January 1975). "60th Name-List of Variable Stars". Information Bulletin on Variable Stars 961: 1–15. Bibcode: 1975IBVS..961....1K. https://ibvs.konkoly.hu/pub/ibvs/0901/0961.pdf. Retrieved 9 December 2024. 
  11. ↑ "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society 400 (4): 1945–61. 2009. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T. 



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