SX Corvi
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corvus |
| Right ascension | 12h 40m 15.04406s[1] |
| Declination | −18° 48′ 00.9336″[1] |
| Apparent magnitude (V) | 8.99 - 9.25 [2] |
| Characteristics | |
| Evolutionary stage | W Ursae Majoris variable |
| Spectral type | F7V[2] |
| Astrometry | |
| Radial velocity (Rv) | 8.71 ± 0.94 km/s |
| Proper motion (μ) | RA: 39.16 ± 1.21 mas/yr Dec.: -6.07 ± 0.80 mas/yr |
| Parallax (π) | 10.94 ± 1.18 mas[3] |
| Distance | approx. 300 ly (approx. 91 pc) |
| Details | |
| Age | 7.32 ± 0.97[4] Gyr |
| Other designations | |
SX Corvi is an eclipsing binary star system in the constellation Corvus, ranging from apparent magnitude 8.99 to 9.25 over 7.5 hours.[2] The system is a contact binary also known as a W Ursae Majoris variable, where the two component stars orbit closely enough to each other for mass to have been transferred between them—in this case the secondary having transferred a large amount of mass to the primary.[4]
Yildiz and colleagues estimated the age of the system at 7.32 ± 0.97 billion years based on study of the properties of the system and estimated rate of mass transfer. They found the current masses of the primary and secondary to be 1.25 ± 0.04 and 0.10 ± 0.01 solar masses respectively, from their original masses of 0.72 ± 0.02 and 1.68 ± 0.05 solar masses.[4]
References
- ^ a b "SX Crv -- Eclipsing binary of W UMa type (contact binary)". Retrieved 21 July 2015.
- ^ a b c Watson, Christopher (19 April 2012). "SX Corvi". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 21 July 2015.
- ^ van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b c Yildiz (2014). "Origin of W UMa-type contact binaries - age and orbital evolution". Monthly Notices of the Royal Astronomical Society. 437 (1): 185–94. arXiv:1310.5526. Bibcode:2014MNRAS.437..185Y. doi:10.1093/mnras/stt1874.
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