19 Aurigae

19 Aurigae is a single[10] star located approximately 3,600 light years away from the Sun in the northern constellation Auriga. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.05.[2] The star is moving closer to the Earth with a heliocentric radial velocity of 4.3 km/s.[2]

19 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  05h 20m 00.92092s[1]
Declination +33° 57′ 29.0049″[1]
Apparent magnitude (V) 5.05[2]
Characteristics
Evolutionary stage bright giant
Spectral type A5 II+[3]
B−V color index 0.287±0.004[2]
Astrometry
Radial velocity (Rv)−4.3±0.9[2] km/s
Proper motion (μ) RA: −0.119[1] mas/yr
Dec.: −4.057[1] mas/yr
Parallax (π)0.9119 ± 0.1885[1] mas
Distanceapprox. 3,600 ly
(approx. 1,100 pc)
Details
Mass7.8±0.5[4] M☉
Radius15[5] R☉
Luminosity (bolometric)7,057[6] L☉
Surface gravity (log g)2.10±0.25[7] cgs
Temperature8,300±100[7] K
Metallicity [Fe/H]−0.19[2] dex
Rotational velocity (v sin i)8.0[8] km/s
Age36.0±2.9[4] Myr
Other designations
19 Aur, NSV 1925, BD+33°1013, GC 6515, HD 34578, HIP 24879, HR 1740, SAO 57906[9]
Database references
SIMBADdata

This is an evolved A-type bright giant star with a stellar classification of A5 II+.[3] It is a variable star of unknown type that ranges in magnitude from 5.03 down to 5.09.[11] This star is an estimated 36[4] million years old with a projected rotational velocity of 8 km/s.[8] It has 8[4] times the mass of the Sun and about 15[5] times the Sun's radius. 19 Aurigae is radiating 7,057[6] times the total luminosity of the Sun from its photosphere at an effective temperature of 8,300 K.[7]

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. 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. Gray, R. O.; et al. (2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
  4. Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  5. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  6. Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
  7. Lyubimkov, Leonid S.; et al. (February 2010), "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society, 402 (2): 1369–1379, arXiv:0911.1335, Bibcode:2010MNRAS.402.1369L, doi:10.1111/j.1365-2966.2009.15979.x.
  8. Lyubimkov, Leonid S.; et al. (2015), "Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants", Monthly Notices of the Royal Astronomical Society, 446 (4): 3447, arXiv:1411.2722, Bibcode:2015MNRAS.446.3447L, doi:10.1093/mnras/stu2299
  9. "19 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-21.
  10. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  11. Chistyakov, Yu. N.; Sokolov, N. A. (November 1999), "On the Variability of 19 Aurigae as Observed by the Hipparcos Satellite", Information Bulletin on Variable Stars, 4808: 1, Bibcode:1999IBVS.4808....1C.
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