22 Aurigae

22 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 23m 22.87264s[1]
Declination +28° 56′ 12.3397″[1]
Apparent magnitude (V) 6.45[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9 Vs[4]
B−V color index −0.040±0.008[2]
Astrometry
Radial velocity (Rv)+9.6±2.7[2] km/s
Proper motion (μ) RA: +16.123[1] mas/yr
Dec.: −32.096[1] mas/yr
Parallax (π)6.0711 ± 0.0689 mas[1]
Distance537 ± 6 ly
(165 ± 2 pc)
Absolute magnitude (MV)0.41[2]
Details
Mass2.85±0.08[3] M☉
Radius3.1[5] R☉
Luminosity89.7+15.5
−10.1[3] L☉
Temperature10,764+140
−49[3] K
Rotational velocity (v sin i)66[3] km/s
Other designations
22 Aur, BD+28°788, HD 35076, HIP 25192, HR 1768, SAO 77139[6]
Database references
SIMBADdata

22 Aurigae is a star located 537 light years away from the Sun in the northern constellation Auriga. It is just bright enough to be barely visible to the naked eye under good viewing conditions, appearing as a blue-white hued star with an apparent visual magnitude of 6.45.[2] At the distance of this object, the brightness is diminished by an extinction of 0.57 due to interstellar dust.[7] The star is moving further from the Earth with a heliocentric radial velocity of +10 km/s,[2] and it is a member of the Taurion OB association, located between Orion and Taurus.[8]

This object is a B-type main-sequence star with a stellar classification of B9 Vs.[4] The 's' notation indicates the spectrum appears "sharp"-lined, due to its relatively moderate projected rotational velocity of 66 km/s.[3] It has 2.9[3] times the mass of the Sun and about 3.1[5] times the Sun's radius. The star is radiating 90[3] times the luminosity of the Sun from its photosphere at an effective temperature of 10,764 K.[3]

References

  1. ^ a b c d e 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.
  2. ^ 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.
  3. ^ a b c d e f g h i Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  4. ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  6. ^ "22 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-21.
  7. ^ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  8. ^ Bouy, H.; Alves, J. (December 2015), "Cosmography of OB stars in the solar neighbourhood", Astronomy & Astrophysics, 584: 13, Bibcode:2015A&A...584A..26B, doi:10.1051/0004-6361/201527058, A26.

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