EQ Virginis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 34m 43.207s[1] |
| Declination | −08° 20′ 31.34″[1] |
| Apparent magnitude (V) | 9.31 |
| Characteristics | |
| Spectral type | K5Ve |
| U−B color index | ? |
| B−V color index | ? |
| Variable type | Flare |
| Astrometry | |
| Radial velocity (Rv) | −22.42 ± 0.14 km/s |
| Proper motion (μ) | RA: −285.90 ± 0.70[1] mas/yr Dec.: −92.13 ± 0.38[1] mas/yr |
| Parallax (π) | 49.48 ± 0.72[1] mas |
| Distance | 65.9 ± 1.0 ly (20.2 ± 0.3 pc) |
| Absolute magnitude (MV) | 10.51 |
| Details | |
| Mass | ? M☉ |
| Radius | ? R☉ |
| Luminosity | ? L☉ |
| Temperature | 4224 ± 80[2] K |
| Metallicity | -0.150 |
| Rotation | ? |
| Age | 30-50 million years[3] years |
| Other designations | |
EQ Virginis is a flare star in the constellation of Virgo. It is an orange dwarf of spectral type K5Ve and is a member of a IC 2391 moving group.[4] The moving group of stars is between 30 and 50 million years old.[3]
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry - ↑ Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics. 530 (A138): 21. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276.
- 1 2 Paulson, Diane B.; Yelda, Sylvana (2006). "Differential Radial Velocities and Stellar Parameters of Nearby Young Stars". arXiv:astro-ph/0605433. Bibcode:2006PASP..118..706P. doi:10.1086/504115.
- ↑ Montes, D.; López-Santiago, J.; Gálvez, M. C.; Fernández-Figueroa, M. J.; De Castro, E.; Cornide, M. (2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society. 328 (1): 45–63. arXiv:astro-ph/0106537. Bibcode:2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x.
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