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GL Virginis

GL Virginis

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 59.3999s[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 mas[6]
Distance21.083 ± 0.006 ly
(6.464 ± 0.002 pc)
Absolute magnitude (MV)14.72[7]
Details
Mass0.12[7] M☉
Radius0.16[8] R☉
Surface gravity (log g)5.0[9] cgs
Temperature3110[9] K
Metallicity [Fe/H]0.17[10] dex
Rotational velocity (v sin i)17[8] km/s
Other designations
GL Vir, G 12-30, GJ 1156, LHS 324, LTT 13440, GCTP 2835.0, LP 494-77, 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.

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

  1. ^ 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. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ a b c "V* GL Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 December 2016.
  4. ^ a b 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. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  6. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  7. ^ a b c "The One Hundred Nearest Star Systems". 2012. Retrieved 25 December 2016.
  8. ^ a b c d 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.
  9. ^ a b c 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.
  10. ^ 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.
  11. ^ Stars within 15 light-years of Gliese & Jahreiss 1156 (The Internet Stellar Database)


Quelle: https://en.wikipedia.org/wiki/GL_Virginis