V538 Aurigae

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V538 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 41m 20.33480s[1]
Declination +53° 28′ 51.8045″[1]
Apparent magnitude (V) 6.25[2]
Spectral type K1 V[3]
U−B color index 0.50[2]
B−V color index 0.84[2]
Variable type BY Dra[4]
Radial velocity (Rv) 0.9[5] km/s
Proper motion (μ) RA: 1.82[1] mas/yr
Dec.: -523.99[1] mas/yr
Parallax (π) 81.45 ± 0.54[1] mas
Distance 40.0 ± 0.3 ly
(12.28 ± 0.08 pc)
Mass 0.871[5] M
Surface gravity (log g) 4.55[5] cgs
Temperature 5,257[5] K
Metallicity [Fe/H] +0.16[6] dex
Rotation 11 days[6]
Rotational velocity (v sin i) 2.80[4] km/s
Age 3.76[5] Gyr
Other designations
BD+53° 934, HD 37394, HIP 26779, HR 1925, NSV 16618.[7]

V538 Aurigae is a star in the northern constellation of Auriga. With an apparent visual magnitude of 6.23, this star requires good dark sky conditions to view with the naked eye. It is located at a distance of 40.0 light-years (12.3 pc) from Earth.

This is a BY Draconis variable,[4] which means it undergoes changes in luminosity because regions of pronounced surface magnetic activity are moved into and out of the line of sight from the Earth as the star rotates (once every 11 days).[6] This has a spectral class of K1 V, indicating that it is a K-type main sequence star. It is a member of the Local Association,[3] and is most likely a thin disk star.[5]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752free to read, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b Montes, D.; et al. (November 2001), "Late-type members of young stellar kinematic groups - I. Single stars", Monthly Notices of the Royal Astronomical Society, 328 (1): 45–63, arXiv:astro-ph/0106537free to read, Bibcode:2001MNRAS.328...45M, doi:10.1046/j.1365-8711.2001.04781.x. 
  4. ^ a b c Mishenina, T. V.; et al. (November 2012), "Activity and the Li abundances in the FGK dwarfs", Astronomy & Astrophysics, 547: 8, arXiv:1210.6843free to read, Bibcode:2012A&A...547A.106M, doi:10.1051/0004-6361/201118412, A106 
  5. ^ a b c d e f Ramírez, I.; et al. (February 2013), "Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo", The Astrophysical Journal, 764 (1): 78, arXiv:1301.1582free to read, Bibcode:2013ApJ...764...78R, doi:10.1088/0004-637X/764/1/78. 
  6. ^ a b c Maldonado, J.; et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics, 521: A12, arXiv:1007.1132free to read, Bibcode:2010A&A...521A..12M, doi:10.1051/0004-6361/201014948. 
  7. ^ "HR 1925 -- Variable of BY Dra type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-01-17. 

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