V538 Aurigae
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.
| 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] |
| Characteristics | |
| 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: 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) |
| Absolute magnitude (MV) | 5.75[6] |
| Details | |
| Mass | 0.871[5] M☉ |
| Surface gravity (log g) | 4.55[5] cgs |
| Temperature | 5,257[5] K |
| Metallicity [Fe/H] | +0.16[7] dex |
| Rotation | 11 days[7] |
| Rotational velocity (v sin i) | 2.80[4] km/s |
| Age | 3.76[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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] 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]
References
- van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
- 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.
- 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, A106
- 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.
- 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.
- 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.
- "HR 1925 -- Variable of BY Dra type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-01-17.
External links
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