Astronomy:GL Virginis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 18m 59.3999s[2] |
| Declination | +11° 07′ 33.7702″[2] |
| Apparent magnitude (V) | 13.898[3] |
| Characteristics | |
| Spectral type | M5[4] |
| U−B color index | +1.065[5] |
| B−V color index | +1.88[5] |
| Variable type | Flare star |
| Astrometry | |
| Radial velocity (Rv) | 5.82[3] km/s |
| Proper motion (μ) | RA: −1269.771±0.056[6] mas/yr Dec.: 203.444±0.033[6] mas/yr |
| Parallax (π) | 154.6999 ± 0.0445[6] mas |
| Distance | 21.083 ± 0.006 ly (6.464 ± 0.002 pc) |
| Absolute magnitude (MV) | 14.72[7] |
| Details | |
| Mass | 0.12[7] M☉ |
| Radius | 0.16[8] R☉ |
| Surface gravity (log g) | 5.0[9] cgs |
| Temperature | 3110[9] K |
| Metallicity [Fe/H] | 0.17[10] dex |
| Rotational velocity (v sin i) | 17[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
GL Virginis, also known as G 12-30, is a star in the constellation of Virgo. It is a faint red dwarf, like more than 70% of the stars located within 10 parsecs of the Solar System; its magnitude visual magnitude is 13.898, making it impossible to see with the naked eye.
Located 21.1 light years away, GL Virginis has a spectral type of M4.5V and an effective temperature of approximately 3110 K.[9] Its luminosity (emitted in the visible section of the electromagnetic spectrum) is only one ten-thousandth compared to the Sun; however, since a significant fraction of its radiation is emitted as invisible infrared light, its bolometric luminosity increases to 0.5% of that of the Sun. Its mass is 12% that of the Sun[7] and its radius is 16% of the Sun.[8] It is a fairly rapid rotator: its rotational velocity is least 17 km/s,[8] which implies that it takes less than half a day to complete a rotation on its axis. The star is emitting a frequent flares, with at least five detected by 2019.[4]
The closest known star system to GL Virginis is Gliese 486, 6.4 light-years away.[11]
References
- ↑ Díez Alonso, E.; Caballero, J. A.; Montes, D.; de Cos Juez, F. J.; Dreizler, S.; Dubois, F.; Jeffers, S. V.; Lalitha, S. et al. (January 2019). "CARMENES input catalogue of M dwarfs. IV. New rotation periods from photometric time series". Astronomy and Astrophysics 621: A126. doi:10.1051/0004-6361/201833316. Bibcode: 2019A&A...621A.126D.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 3.2 "V* GL Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+GL+Vir.
- ↑ 4.0 4.1 Rodríguez Martínez, Romy; Lopez, Laura A.; Shappee, Benjamin J.; Schmidt, Sarah J.; Jayasinghe, Tharindu; Kochanek, Christopher S.; Auchettl, Katie; Holoien, Thomas W.-S. (2019), "A Catalog of M-dwarf Flares with ASAS-SN", The Astrophysical Journal 892 (2): 144, doi:10.3847/1538-4357/ab793a
- ↑ 5.0 5.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1.
- ↑ 6.0 6.1 6.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 7.0 7.1 7.2 "The One Hundred Nearest Star Systems". 2012. http://www.recons.org/TOP100.posted.htm.
- ↑ 8.0 8.1 8.2 8.3 Reiners, Ansgar; Basri, Gibor; Browning, Matthew (2009). "Evidence for Magnetic Flux Saturation in Rapidly Rotating M Stars". The Astrophysical Journal 692 (1): 538–545. doi:10.1088/0004-637X/692/1/538. Bibcode: 2009ApJ...692..538R. https://ore.exeter.ac.uk/repository/bitstream/handle/10871/10302/Evidence%20for%20Magnetic%20Flux%20Saturation%20in%20Rapidly%20Rotating%20M%20Stars.pdf.
- ↑ 9.0 9.1 9.2 Lépine, Sébastien (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal 145 (4): 102. doi:10.1088/0004-6256/145/4/102. Bibcode: 2013AJ....145..102L.
- ↑ Newton, Elisabeth R. (2014). "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs". The Astronomical Journal 147 (1): 20. doi:10.1088/0004-6256/147/1/20. Bibcode: 2014AJ....147...20N.
- ↑ Stars within 15 light-years of Gliese & Jahreiss 1156 (The Internet Stellar Database)
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