Astronomy:GL Virginis

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Short description: Star in the constellation Virgo
GL Virginis
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A near-infrared light curve for GL Virginis, adapted from Díez Alonso et al. (2019)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Virgo
Right ascension  12h 18m 59.39973s[2]
Declination +11° 07′ 33.7732″[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[2] mas/yr
Dec.: 203.444[2] mas/yr
Parallax (π)154.6999 ± 0.0445[2] mas
Distance21.083 ± 0.006 ly
(6.464 ± 0.002 pc)
Absolute magnitude (MV)14.72[6]
Details
Mass0.12[6] M☉
Radius0.16[7] R☉
Surface gravity (log g)5.0[8] cgs
Temperature3110[8] K
Metallicity [Fe/H]0.17[9] dex
Rotation0.491 d[1]
Rotational velocity (v sin i)17[7] km/s
Other designations
GL Vir, GJ 1156, G 12-30, LHS 324, LP 494-77, LTT 13440, PLX 2835.0, 2MASS J12185939+1107338[3]
Database references
SIMBADdata

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.

In 1977, Glen J. Veeder and Olav L. Hansen announced that the star, then called GL 12-30, is a variable star.[10] It was given its variable star designation, GL Virginis, in 1981.[11]

Located 21.1 light years away, GL Virginis has a spectral type of M4.5V and an effective temperature of approximately 3110 K.[8] 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[6] and its radius is 16% of the Sun.[7] It is a fairly rapid rotator: its rotational velocity is least 17 km/s,[7] which implies that it takes less than half a day to complete a rotation on its axis. The star is emitting 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.[12]

References

  1. ↑ 1.0 1.1 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. ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 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. ↑ 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. ↑ 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. ↑ 6.0 6.1 6.2 "The One Hundred Nearest Star Systems". 2012. http://www.recons.org/TOP100.posted.htm. 
  7. ↑ 7.0 7.1 7.2 7.3 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. 
  8. ↑ 8.0 8.1 8.2 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. 
  9. ↑ 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. 
  10. ↑ Veeder, G. J.; Hansen, O. L. (April 1977). "Flare Activity on G12-30". Information Bulletin on Variable Stars 1266. Bibcode: 1977IBVS.1266....1V. https://ibvs.konkoly.hu/pub/ibvs/1201/1266.pdf. Retrieved 18 August 2025. 
  11. ↑ Kholopov, P. N.; Samus, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (February 1981). "65th Name-List of Variable Stars". Information Bulletin on Variable Stars 1921: 1-21. Bibcode: 1981IBVS.1921....1K. https://ibvs.konkoly.hu/pub/ibvs/1901/1921.pdf. Retrieved 18 August 2025. 
  12. ↑ Stars within 15 light-years of Gliese & Jahreiss 1156 (The Internet Stellar Database)




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