AW Canum Venaticorum

AW Canum Venaticorum is a variable star[3] in the constellation Canes Venatici. It is visible to the naked eye with a nominal apparent visual magnitude of 4.76.[2] The distance to this star, as measured from its annual parallax shift of 5.3 mas,[1] is around 620 light years. It is moving closer with a heliocentric radial velocity of −44 km/s.[2]

AW Canum Venaticorum
Observation data
Epoch J2000      Equinox J2000
Constellation Canes Venatici
Right ascension  13h 51m 47.47504s[1]
Declination +34° 26′ 39.2474″[1]
Apparent magnitude (V) 4.76[2] (4.73 – 4.85)[3]
Characteristics
Spectral type M3- IIIa[4]
B−V color index 1.611±0.006[2]
Variable type Lb[3]
Astrometry
Radial velocity (Rv)−44.21±0.25[2] km/s
Proper motion (μ) RA: −20.477[1] mas/yr
Dec.: −31.626[1] mas/yr
Parallax (π)5.2734 ± 0.2529[1] mas
Distance620 ± 30 ly
(190 ± 9 pc)
Absolute magnitude (MV)−1.56[2]
Details
Mass2.18±0.16[5] M☉
Radius117.41+4.25
−4.57[5] R☉
Luminosity2,387±213[5] L☉
Surface gravity (log g)0.98±0.30[6] cgs
Temperature3,529±25[6] K
Metallicity [Fe/H]−0.09±0.11[6] dex
Age1.11±0.21[5] Gyr
Other designations
AW CVn, BD+35° 2496, FK5 3102, HD 120933, HIP 67665, HR 5219, SAO 63793[7]
Database references
SIMBADdata

At the age of 1.1 billion years,[5] this is an evolved red giant star with a stellar classification of M3- IIIa.[4] It is a slow irregular variable of type Lb, with a brightness that ranges between magnitudes 4.73 and 4.85.[3] The star has 2.2[5] times the mass of the Sun and has expanded to 117[5] times the Sun's radius. It is radiating 2,387[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,529 K.[6]

References
  1. 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.
  2. 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.
  3. 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: 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085.
  4. 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.
  5. Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155, 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b.
  6. 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.
  7. "HD 120933". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 August 2018.
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