OY Carinae
| Observation data Epoch {{{epoch}}} Equinox | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 06m 22.07s |
| Declination | −70° 14′ 04.6″ |
| Apparent magnitude (V) | +12.2 |
| Characteristics | |
| Spectral type | DA / M6V |
| Astrometry | |
| Distance | 277.1 ly (85[1] pc) |
| Details | |
| Mass | ≈0.7[1]/0.07[2] M☉ |
| Radius | 0.011[1]/0.127[2] R☉ |
| Luminosity | 0.0055/0.00117 L☉ |
| Temperature | 15,000/3,000 K |
| Orbit | |
| Period (P) | 0.000172 yr |
| Semi-major axis (a) | 0.00213 Astronomical Units" |
| Eccentricity (e) | 0.0 |
| Inclination (i) | 83.3° |
| Other designations | |
OY Car, RX J1006.5-7014, SON 6302, 2MASS J10062206-7014045, SBC9 600, AAVSO 1004-69 | |
| Database references | |
| SIMBAD | data |
OY Carinae (abbreviated OY Car) is an eclipsing binary system approximately 277 light-years away from the Sun, classed as cataclysmic variable. The system comprises an eclipsing white dwarf and red dwarf that orbit each other every 1.51 hours, and possibly a yet unconfirmed third low-mass (substellar?) companion.
Planetary system?
Greenhill et al. (2009) would invoke the presence of a third object to explain orbital period variations with an apparent periodicity of roughly 35 years. The third body could yield a minimum mass 7 times greater than Jupiter and be located 9.5 Astronomical Units away from the cataclysmic variable system,[3] being likely either a massive planetary object or else a very low-mass brown dwarf. It is likely that the apparent change is due to solar-cycle type magnetic activity in the secondary star. Large irregular deviations from the general trend, with time-scales of years, also occur. Further observations will be able to confirm either discard the presence of a substellar companion.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | ≥7 MJ | 9.5 | 35±3.5 | ? | — | — |
See also
References
- 1 2 3 Mauche & Raymond (2000). "The EUV Emission-Line spectrum of OY Carinae in superoutburst: scattering in the wind" (PDF). RevMexAA (Serie de Conferencias). 9: 232–233.
- 1 2 Wood; Horne, Keith; Berriman, Graham; Wade, Richard A. (1989). "Eclipse studies of the dwarf nova OY Carinae in quiescence". Astrophysical Journal. 341: 974–994. Bibcode:1989ApJ...341..974W. doi:10.1086/167557.
- 1 2 Greenhill; Hill, K. M.; Dieters, S.; Fienberg, K.; et al. (2006). "Decrease in the orbital period of dwarf nova OY Carinae". Monthly Notices of the Royal Astronomical Society. 372 (3): 1129–1132. arXiv:astro-ph/0602331
. Bibcode:2006MNRAS.372.1129G. doi:10.1111/j.1365-2966.2006.10920.x.
Coordinates: 
10h 06m 22.07s, −70° 14′ 04.6″