BV Centauri
| Observation data Epoch J2000 Equinox J2000 | ||
|---|---|---|
| Constellation | Centaurus | |
| Right ascension | 13h 31m 19.485s[2] | |
| Declination | −54° 58′ 33.52″[2] | |
| Apparent magnitude (V) | 13.05[3] (10.7 to 14.0)[4] | |
| Characteristics | ||
| Spectral type | G5-G8IV-V (secondary)[3] | |
| U−B color index | -0.22[3] | |
| B−V color index | 0.77[3] | |
| Variable type | SS Cyg[4]
| |
| Absolute magnitude (MV) | +3.0 - +5.8[6] | |
Semi-amplitude (K1) (primary) 128±3[7] km/s | | |
| Semi-amplitude (K2) (secondary) | 137.3±0.3[5] km/s | |
| Details | ||
| Primary (white dwarf) | ||
Rotational velocity (v sin i) | 500 ± 100[8] km/s | |
| Secondary | ||
| Mass | 1.05+0.23 −0.14[5] M☉ | |
| Radius | 1.41 ± 0.04[7] R☉ | |
| Surface gravity (log g) | 3.5[5] cgs | |
| Temperature | 5250[5] K | |
AAVSO 1325-54[9] | ||
| Database references | ||
| SIMBAD | data | |
BV Centauri is a
mas has been measured, corresponding to about 360 pc.[6]
Cataclysmic variables are short-period binary systems in which a
zero age main sequence.[3][7] The reconstruction of its surface by Doppler imaging revealed it to be a highly magnetically active star, with about 25% of its surface covered in starspots which are much more abundant on the hemisphere facing the white dwarf. Furthermore, a prominence was detected above the secondary star's surface, also in the side facing the white dwarf.[5] The white dwarf primary can be observed clearly at ultraviolet wavelengths where it is the strongest source. Any accretion disk in the system appears relatively faint.[8]
The system has a
inclined by 53 ± 4° in relation to the plane of the sky.[5]
It has been noted that BV Centauri's light curve during outbursts has anomalous behavior for a dwarf nova, with a long interval of up to 15 days before reaching peak brightness and no plateau at maximum brightness, and it has been compared to the classic nova GK Persei. Based on this, it has been proposed that BV Centauri could have generated an unobserved nova outburst in the 19th century, which was missed by the observers at the time.[10][12]
References
- Bibcode:2012AcA....62...67K. Retrieved 28 November 2021.
- ^ Bibcode:2000A&A...355L..27H.
- ^ doi:10.1086/157699.
- ^ Bibcode:2009yCat....102025S. VizieR table entry
- ^ S2CID 2073273.
- ^ S2CID 56464882.
- ^ doi:10.1086/160504.
- ^ S2CID 14393007.
- ^ "V* BV Cen -- Dwarf Nova". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-11-07.
- ^ Bibcode:2009JAVSO..37...23P.
- S2CID 148571913.
- S2CID 123400202.
