V538 Aurigae
{{Short description|Star in constellation Auriga}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = A light curve for V538 Aurigae, plotted from TESS data. The data was folded with the period of 10.86 days which was published by Gaidos et al. (2000).
}}
{{Starbox observe
| epoch = J2000
| dec = {{DEC|+53|28|51.8106}}
| constell = Auriga
}}
{{Starbox character
| type = Main sequence
| variable = BY Dra
}}
{{Starbox astrometry
| parallax = 81.4300
| p_error = 0.0487
}}
{{Starbox detail
| radius = {{val|0.82|0.02|0.03}}
| luminosity = {{val|0.478|0.001}}
| temperature = {{val|5303|100|63|fmt=commas}}
}}
{{Starbox catalog
| names = {{odlist | V=V538 Aur | BD=+53°934 | GJ=211 | HD=37394 | HIP=26779 | HR=1925 | WDS=J05413+5329A }}
}}
{{Starbox reference
| Simbad = HD+37394
}}
{{Starbox end}}
V538 Aurigae is a single 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 {{Convert|40.0|ly|pc|lk=on}} from Sun based on parallax. The star is drifting further away with a radial velocity of 0.9 km/s. It is a member of the Local Association, and is most likely a thin disk star.
Eric Gaidos et al. discovered that V538 Aurigae is a variable star based on observations by robotic telescopes at Fairborn Observatory from 1993 through 1999, and they announced their discovery in 2000. The star was given its variable star designation in 2006. This is a BY Draconis variable, 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). It has a spectral class of K1 V, indicating that it is a K-type main sequence star. The star has 87% of the mass of the Sun and 82% of the Sun's radius. It is an estimated 3.76 billion years old. The star is radiating 48% of the Sun's luminosity from its photosphere at an effective temperature of 5,303 K.
It has a common proper motion companion designated Vys 465 (HD 233153), which is a red dwarf with a class of M0.5V and a visual magnitude of 9.87. Their projected separation is {{val|1204|ul=AU|fmt=commas}}.
References
{{Reflist|refs=
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}}
External links
- [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?GJ%20211 GJ 211] Nearby Stars Catalog VizieR entry
- [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%201925 HR 1925] Bright Star Catalog VizieR entry
- [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J05413%2b5329A CCDM J05413+5329] CCDM catalog VizieR entry
- [http://aladin.u-strasbg.fr/AladinPreview?-c=05+41+20.3357%2B53+28+51.808&ident=V*+V538+Aur&submit=Aladin+previewer Image V538 Aurigae] Aladin image
{{Stars of Auriga}}
{{DEFAULTSORT:V538 Aurigae}}
Category:K-type main-sequence stars
Category:BY Draconis variables