V538 Aurigae

V538 Aurigae is a single[9] 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 Sun based on parallax. The star is drifting further away with a radial velocity of 0.9 km/s.[5] It is a member of the Local Association,[3] and is most likely a thin disk star.[5]

V538 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 41m 20.33573s[1]
Declination +53° 28′ 51.8106″[1]
Apparent magnitude (V) 6.25[2]
Characteristics
Evolutionary stage Main sequence
Spectral type K1 V[3]
U−B color index 0.50[2]
B−V color index 0.84[2]
Variable type BY Dra[4]
Astrometry
Radial velocity (Rv)0.9[5] km/s
Proper motion (μ) RA: +2.784[1] mas/yr
Dec.: −523.602[1] mas/yr
Parallax (π)81.4300 ± 0.0487[1] mas
Distance40.05 ± 0.02 ly
(12.280 ± 0.007 pc)
Absolute magnitude (MV)5.75[6]
Details
Mass0.871[5] M☉
Radius0.82+0.02
−0.03[1] R☉
Luminosity0.478±0.001[1] L☉
Surface gravity (log g)4.55[5] cgs
Temperature5,303+100
−63[1] K
Metallicity [Fe/H]+0.16[7] dex
Rotation11 days[7]
Rotational velocity (v sin i)2.80[4] km/s
Age3.76[5] Gyr
Other designations
V538 Aur, NSV 16618, BD+53° 934, GJ 211, HD 37394, HIP 26779, HR 1925, WDS J05413+5329A[8]
Database references
SIMBADdata

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).[7] It has a spectral class of K1 V, indicating that it is a K-type main sequence star.[3] The star has 87%[5] of the mass of the Sun and 82%[1] of the Sun's radius. It is an estimated 3.76 billion years old.[5] The star is radiating 48% of the Sun's luminosity from its photosphere at an effective temperature of 5,303 K.[1]

It has a common proper motion companion designated Vys 465 (HD 233153),[10] which is a red dwarf with a class of M0.5V and a visual magnitude of 9.87. Their projected separation is 1,204 AU.[11]

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. 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. Montes, D.; et al. (November 2001), "Late-type members of young stellar kinematic groups - I. Single stars" (PDF), Monthly Notices of the Royal Astronomical Society, 328 (1): 45–63, arXiv:astro-ph/0106537, Bibcode:2001MNRAS.328...45M, doi:10.1046/j.1365-8711.2001.04781.x, S2CID 55727428
  4. Mishenina, T. V.; et al. (November 2012), "Activity and the Li abundances in the FGK dwarfs", Astronomy & Astrophysics, 547: 8, arXiv:1210.6843, Bibcode:2012A&A...547A.106M, doi:10.1051/0004-6361/201118412, S2CID 119287319, A106
  5. 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:1301.1582, Bibcode:2013ApJ...764...78R, doi:10.1088/0004-637X/764/1/78, S2CID 118751608
  6. Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511
  7. 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:1007.1132, Bibcode:2010A&A...521A..12M, doi:10.1051/0004-6361/201014948, S2CID 119209183
  8. "HD 37394". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-08.
  9. Halbwachs, J. -L; et al. (2018), "Multiplicity among solar-type stars. IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs", Astronomy and Astrophysics, 619: A81, arXiv:1808.04605, Bibcode:2018A&A...619A..81H, doi:10.1051/0004-6361/201833377, S2CID 119437322
  10. Soderblom, David R.; Clements, Sandra D. (April 1987), "Chromospheric and Transition-Region Emission from Young Solar-Type Stars in Clusters, Kinematic Groups, and the Field", The Astronomical Journal, 93: 920–937, Bibcode:1987AJ.....93..920S, doi:10.1086/114378
  11. Halbwachs, J. -L.; et al. (February 2017), "Double stars with wide separations in the AGK3 - II. The wide binaries and the multiple systems*", Monthly Notices of the Royal Astronomical Society, 464 (4): 4966–4976, arXiv:1610.04423, Bibcode:2017MNRAS.464.4966H, doi:10.1093/mnras/stw2683
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