GL Virginis
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 12h 18m 59.395s[1] |
Declination | +11° 07′ 33.90″[1] |
Apparent magnitude (V) | 13.898[2] |
Characteristics | |
Spectral type | M4.5Ve[2] |
U−B color index | +1.065[3] |
B−V color index | +1.88[3] |
Variable type | Flare star |
Astrometry | |
Radial velocity (Rv) | 5.82[2] km/s |
Proper motion (μ) | RA: -1263.0[4] mas/yr Dec.: 199.0[4] mas/yr |
Parallax (π) | 152.9 ± 3[5] mas |
Distance | 21.3 ± 0.4 ly (6.5 ± 0.1 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 |
Rotational velocity (v sin i) | 17[7] 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 21.3 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 closest known star system to GL Virginis is Gliese 486, 6.4 light-years away.[10]
References
- 1 2 Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
- 1 2 3 4 "V* GL Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 December 2016.
- 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
- 1 2 Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
- ↑ Jenkins, Louise F. (1952). "General catalogue of trigonometric stellar parallaxes". New Haven, Yale University Observatory. Bibcode:1952gcsr.book.....J.
- 1 2 3 "The One Hundred Nearest Star Systems". 2012. Retrieved 25 December 2016.
- 1 2 3 4 Reiners, A.; et al. (2009). "Evidence for Magnetic Flux Saturation in Rapidly Rotating M Stars". The Astrophysical Journal. 692 (1): 538–545. arXiv:0810.5139. Bibcode:2009ApJ...692..538R. doi:10.1088/0004-637X/692/1/538.
- 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). arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102.
- ↑ Newton, Elisabeth R. (2014). "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs". The Astronomical Journal. 147 (1). arXiv:1310.1087. Bibcode:2014AJ....147...20N. doi:10.1088/0004-6256/147/1/20.
- ↑ Stars within 15 light-years of Gliese & Jahreiss 1156 (The Internet Stellar Database)
- Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs". The Astrophysical Journal. 784 (2): 156. arXiv:1312.3241. Bibcode:2014ApJ...784..156D. doi:10.1088/0004-637X/784/2/156. Table with parallaxes.