GL Virginis

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GL Virginis
GLVirLightCurve.png
A near-infrared light curve for GL Virginis, adapted from Díez Alonso et al. (2019) [1]
Observation data
Epoch J2000       Equinox J2000
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 mas/yr [2]
Dec.: 203.444 mas/yr [2]
Parallax (π)154.6999±0.0445  mas [2]
Distance 21.083 ± 0.006  ly
(6.464 ± 0.002  pc)
Absolute magnitude  (MV)14.72 [6]
Details
Mass 0.12 [6]   M☉
Radius 0.16 [7]   R☉
Surface gravity (log g)5.0 [8]   cgs
Temperature 3110 [8]   K
Metallicity [Fe/H]0.17 [9]   dex
Rotation 0.491 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
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.

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 2 Díez Alonso, E.; Caballero, J. A.; Montes, D.; de Cos Juez, F. J.; Dreizler, S.; Dubois, F.; Jeffers, S. V.; Lalitha, S.; Naves, R.; Reiners, A.; Ribas, I.; Vanaverbeke, S.; Amado, P. J.; Béjar, V. J. S.; Cortés-Contreras, M.; Herrero, E.; Hidalgo, D.; Kürster, M.; Logie, L.; Quirrenbach, A.; Rau, S.; Seifert, W.; Schöfer, P.; Tal-Or, L. (January 2019). "CARMENES input catalogue of M dwarfs. IV. New rotation periods from photometric time series". Astronomy and Astrophysics. 621: A126. arXiv: 1810.03338 . Bibcode:2019A&A...621A.126D. doi: 10.1051/0004-6361/201833316 .
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 "V* GL Vir". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 25 December 2016.
  4. 1 2 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, arXiv: 1912.05549 , doi: 10.3847/1538-4357/ab793a , S2CID   209323915
  5. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  6. 1 2 3 "The One Hundred Nearest Star Systems". 2012. Retrieved 25 December 2016.
  7. 1 2 3 4 Reiners, Ansgar; Basri, Gibor; Browning, Matthew (2009). "Evidence for Magnetic Flux Saturation in Rapidly Rotating M Stars" (PDF). The Astrophysical Journal. 692 (1): 538–545. arXiv: 0810.5139 . Bibcode:2009ApJ...692..538R. doi:10.1088/0004-637X/692/1/538. hdl:10871/10302. S2CID   15833388.
  8. 1 2 3 Lépine, Sébastien (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv: 1206.5991 . Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID   117144290.
  9. ↑ Newton, Elisabeth R. (2014). "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs". The Astronomical Journal. 147 (1): 20. arXiv: 1310.1087 . Bibcode:2014AJ....147...20N. doi:10.1088/0004-6256/147/1/20. S2CID   26818462.
  10. ↑ Veeder, G. J.; Hansen, O. L. (April 1977). "Flare Activity on G12-30" (PDF). Information Bulletin on Variable Stars. 1266. Bibcode:1977IBVS.1266....1V . 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" (PDF). Information Bulletin on Variable Stars. 1921: 1–21. Bibcode:1981IBVS.1921....1K . Retrieved 18 August 2025.
  12. ↑ Stars within 15 light-years of Gliese & Jahreiss 1156 (The Internet Stellar Database)


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