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AW Canum Venaticorum

Topic: Astronomy

 From HandWiki - Reading time: 4 min

Short description: Star in constellation Canes Venatici
AW Canum Venaticorum
Location of AW Canum Venaticorum (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
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

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]

A light curve for AW Canum Venaticorum, plotted from Hipparcos data[8]

The variability of the brightness of HR 5219 was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory.[9] It was given its variable star designation, AW Canum Venaticorum, in 1977.[10]

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 3.2 3.3 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 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S. 
  4. ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Baines, Ellyn K. et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B. 
  6. ↑ 6.0 6.1 6.2 6.3 Prugniel, P. et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics 531: A165, doi:10.1051/0004-6361/201116769, Bibcode: 2011A&A...531A.165P. 
  7. ↑ "HD 120933". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+120933. 
  8. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 
  9. ↑ Stebbins, Joel; Huffer, C. M. (1928). "The Constancy of the Light of Red Stars". Publications of the Washburn Observatory 15: 137–174. Bibcode: 1928PWasO..15..137S. https://articles.adsabs.harvard.edu/pdf/1928PWasO..15..137S. Retrieved 5 December 2024. 
  10. ↑ Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977). "62nd Name-List of Variable Stars". Information Bulletin on Variable Stars 1248: 1–25. Bibcode: 1977IBVS.1248....1K. https://ibvs.konkoly.hu/pub/ibvs/1201/1248.pdf. Retrieved 8 December 2024. 



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