Summary
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.[3] The distance to this object is approximately 520 light years based on parallax,[2] but it is drifting closer with a radial velocity of −67 km/s.[3]
 A visual band light curve for BC Canis Minoris, plotted from data presented by Tabur et al. (2009)[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Minor |
| Right ascension | 07h 52m 07.19000s[2] |
| Declination | 03° 16′ 38.4465″[2] |
| Apparent magnitude (V) | 6.30[3] (6.14 to 6.42)[4] |
| Characteristics | |
| Evolutionary stage | AGB[5] |
| Spectral type | M4/5III[6] |
| B−V color index | 1.464±0.015[3] |
| Variable type | SRb[4] |
| Astrometry | |
| Radial velocity (Rv) | −66.91±0.24[3] km/s |
| Proper motion (μ) | RA: +49.415[2] mas/yr Dec.: −78.835[2] mas/yr |
| Parallax (π) | 6.2916 ± 0.1748 mas[2] |
| Distance | 520 ± 10 ly (159 ± 4 pc) |
| Absolute magnitude (MV) | 0.36[3] |
| Details | |
| Radius | 60.4+7.6 −10.3[2] R☉ |
| Luminosity | 496.7±15.9[2] L☉ |
| Temperature | 3,507+344 −201[2] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
This 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.[8] With the supply of hydrogen at its core exhausted, it has cooled and expanded off the main sequence and now has around 60[2] times the girth of the Sun. On average, the star is radiating about 497[2] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,507 K.[2]
References edit
- ^ 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. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x.
- ^ a b c d e f g h i j k l 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.
- ^ a b c d e f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
- ^ a b Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". Astronomical Journal. 104 (1): 275–313. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ "BC CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-13.
- ^ Tabur, V.; Bedding, T. R. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–61. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x. S2CID 15358380.