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[3] mas |
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
- 1 2 "SX Crv -- Eclipsing binary of W UMa type (contact binary)". Retrieved 21 July 2015.
- 1 2 3 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.
- 1 2 3 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.