AW Canum Venaticorum is a variable star[4] in the constellation Canes Venatici. It is visible to the naked eye with a nominal apparent visual magnitude of 4.76.[3] The distance to this star, as measured from its annual parallax shift of 5.3 mas,[2] is around 620 light years. It is moving closer with a heliocentric radial velocity of −44 km/s.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canes Venatici |
| Right ascension | 13h 51m 47.47504s[2] |
| Declination | +34° 26′ 39.2474″[2] |
| Apparent magnitude (V) | 4.76[3] (4.73 – 4.85)[4] |
| Characteristics | |
| Spectral type | M3- IIIa[5] |
| B−V color index | 1.611±0.006[3] |
| Variable type | Lb[4] |
| Astrometry | |
| Radial velocity (Rv) | −44.21±0.25[3] km/s |
| Proper motion (μ) | RA: −20.477[2] mas/yr Dec.: −31.626[2] mas/yr |
| Parallax (π) | 5.2734 ± 0.2529 mas[2] |
| Distance | 620 ± 30 ly (190 ± 9 pc) |
| Absolute magnitude (MV) | −1.56[3] |
| Details | |
| Mass | 2.18±0.16[6] M☉ |
| Radius | 117.41+4.25 −4.57[6] R☉ |
| Luminosity | 2,387±213[6] L☉ |
| Surface gravity (log g) | 0.98±0.30[7] cgs |
| Temperature | 3,529±25[7] K |
| Metallicity [Fe/H] | −0.09±0.11[7] dex |
| Age | 1.11±0.21[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
At the age of 1.1 billion years,[6] this is an evolved red giant star with a stellar classification of M3- IIIa.[5] It is a slow irregular variable of type Lb, with a brightness that ranges between magnitudes 4.73 and 4.85.[4] The star has 2.2[6] times the mass of the Sun and has expanded to 117[6] times the Sun's radius. It is radiating 2,387[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,529 K.[7]
References
edit- ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
- ^ a b c d e f 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.
- ^ 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 d Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373, S2CID 123149047.
- ^ a b c d e f g h Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1), 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.
- ^ a b c d Prugniel, P.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
- ^ "HD 120933". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 August 2018.