Astronomy:V538 Aurigae
 A light curve for V538 Aurigae, plotted from Hipparcos data.[1] The data was folded with the period of 10.86 days which was published by Gaidos et al. (2000).[2] | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 41m 20.33573s[3] |
| Declination | +53° 28′ 51.8106″[3] |
| Apparent magnitude (V) | 6.25[4] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | K1 V[5] |
| U−B color index | 0.50[4] |
| B−V color index | 0.84[4] |
| Variable type | BY Dra[6] |
| Astrometry | |
| Radial velocity (Rv) | 0.9[7] km/s |
| Proper motion (μ) | RA: +2.784[3] mas/yr Dec.: −523.602[3] mas/yr |
| Parallax (π) | 81.4300 ± 0.0487[3] mas |
| Distance | 40.05 ± 0.02 ly (12.280 ± 0.007 pc) |
| Absolute magnitude (MV) | 5.75[8] |
| Details | |
| Mass | 0.871[7] M☉ |
| Radius | 0.82+0.02 −0.03[3] R☉ |
| Luminosity | 0.478±0.001[3] L☉ |
| Surface gravity (log g) | 4.55[7] cgs |
| Temperature | 5,303+100 −63[3] K |
| Metallicity [Fe/H] | +0.16[9] dex |
| Rotation | 11 days[9] |
| Rotational velocity (v sin i) | 2.80[6] km/s |
| Age | 3.76[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
V538 Aurigae is a single[11] 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.[7] It is a member of the Local Association,[5] and is most likely a thin disk star.[7]
This is a BY Draconis variable,[6] 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).[9] It has a spectral class of K1 V, indicating that it is a K-type main sequence star.[5] The star has 87%[7] of the mass of the Sun and 82%[3] of the Sun's radius. It is an estimated 3.76 billion years old.[7] The star is radiating 48% of the Sun's luminosity from its photosphere at an effective temperature of 5,303 K.[3]
It has a common proper motion companion designated Vys 465 (HD 233153),[12] which is a red dwarf with a class of M0.5V and a visual magnitude of 9.87. Their projected separation is 1,204 astronomical unit|AU.[13]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ Gaidos, E. J.; Henry, G. W.; Henry, S. M. (August 2000). "Spectroscopy and Photometry of Nearby Young Solar Analogs". The Astronomical Journal 120 (2): 1006–1013. doi:10.1086/301488. Bibcode: 2000AJ....120.1006G.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 4.0 4.1 4.2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. SIMBAD. Bibcode: 1986EgUBV........0M.
- ↑ 5.0 5.1 5.2 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. doi:10.1046/j.1365-8711.2001.04781.x. Bibcode: 2001MNRAS.328...45M.
- ↑ 6.0 6.1 6.2 Mishenina, T. V. et al. (November 2012). "Activity and the Li abundances in the FGK dwarfs". Astronomy & Astrophysics 547: 8. doi:10.1051/0004-6361/201118412. A106. Bibcode: 2012A&A...547A.106M.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 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. doi:10.1088/0004-637X/764/1/78. Bibcode: 2013ApJ...764...78R.
- ↑ 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. doi:10.1051/0004-6361/200811191. Bibcode: 2009A&A...501..941H.
- ↑ 9.0 9.1 9.2 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. doi:10.1051/0004-6361/201014948. Bibcode: 2010A&A...521A..12M.
- ↑ "HD 37394". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+37394.
- ↑ 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. doi:10.1051/0004-6361/201833377. Bibcode: 2018A&A...619A..81H.
- ↑ 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. doi:10.1086/114378. Bibcode: 1987AJ.....93..920S.
- ↑ 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. doi:10.1093/mnras/stw2683. Bibcode: 2017MNRAS.464.4966H.
External links
- GJ 211 Nearby Stars Catalog VizieR entry
- HR 1925 Bright Star Catalog VizieR entry
- CCDM J05413+5329 CCDM catalog VizieR entry
- Image V538 Aurigae Aladin image
 |  |
