12 Aurigae

12 Aurigae is a star in the northern constellation Auriga. It lies below the normal limit for visibility to the naked eye, having an apparent visual magnitude of 6.988.[2] It lacks a designation from the Hipparcos catalogue.[7] This is a Be star with a stellar classification of B2 Ve,[3] indicating that the spectrum displays emission lines. It is located just under half a degree north of Capella.[7]

12 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 16m 27.08243s[1]
Declination +46° 24′ 57.8145″[1]
Apparent magnitude (V) 6.988[2]
Characteristics
Spectral type B2 Ve[3]
Astrometry
Proper motion (μ) RA: −2.955[1] mas/yr
Dec.: −1.287[1] mas/yr
Parallax (π)1.3886 ± 0.0650 mas[1]
Distance2,300 ± 100 ly
(720 ± 30 pc)
Details
Mass3.0[4] M☉
Radius2.2[5] R☉
Luminosity25[5] L☉
Surface gravity (log g)2.47[4] cgs
Temperature8,688[5] K
Metallicity−0.94[4]
Rotational velocity (v sin i)100±41[6] km/s
Other designations
12 Aur, BD+46°989, GC 6424, HD 33988, SAO 40183, PPM 47919[7]
Database references
SIMBADdata

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. Gaia DR2 record for this source at VizieR.
  2. Paunzen, E. (2015). "A new catalogue of Strömgren-Crawford uvbyβ photometry". Astronomy & Astrophysics. 580: A23. arXiv:1506.04568. Bibcode:2015A&A...580A..23P. doi:10.1051/0004-6361/201526413. S2CID 73623700.
  3. Burbidge, G. R.; Burbidge, E. Margaret (September 1953). "The Balmer Decrement in Some Be Stars". Astrophysical Journal. 118: 252. Bibcode:1953ApJ...118..252B. doi:10.1086/145747.
  4. Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
  5. Stassun, Keivan G.; et al. (September 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156: 102. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. ISSN 0004-6256.
  6. Halbedel, Elaine M. (September 1996). "Rotational Velocity Determinations for 164 Be and B Stars". Publications of the Astronomical Society of the Pacific. 108: 833. Bibcode:1996PASP..108..833H. doi:10.1086/133804.
  7. "12 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-04.
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