Omicron Puppis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h 48m 05.16839s |
| Declination | −25° 56′ 13.8123″ |
| Apparent magnitude (V) | +4.48 |
| Characteristics | |
| Spectral type | B1 IVnne |
| U−B color index | −1.02 |
| B−V color index | −0.09 |
| Variable type | LERI |
| Astrometry | |
| Radial velocity (Rv) | +15.0 km/s |
| Proper motion (μ) | RA: −10.09 mas/yr Dec.: +4.26 mas/yr |
| Parallax (π) | 2.30±0.23 mas |
| Distance | 1,400 ± 100 ly (430 ± 40 pc) |
| Absolute magnitude (MV) | −3.77 |
| Orbit | |
| Period (P) | 28.903±0.004 d |
| Eccentricity (e) | 0 |
| Periastron epoch (T) | 2456012.93 ± 0.04 |
| Semi-amplitude (K2) (secondary) | 159.7±11.7 km/s |
| Details | |
| Mass | 15.5±0.8 M☉ |
| Radius | 13.5 R☉ |
| Luminosity (bolometric) | 59,279 L☉ |
| Surface gravity (log g) | 2.90 cgs |
| Temperature | 26,000 K |
| Rotational velocity (v sin i) | 315 km/s |
| Age | 11.1±0.5 Myr |
| Other designations | |
| ο Pup, CPD−25°2882, HD 63462, HIP 38070, HR 3045, SAO 174558, WDS J07481-2556A | |
| Database references | |
| SIMBAD | data |
Omicron Puppis (ο Puppis) is candidate binary star system in the southern constellation of Puppis. It is visible to the naked eye, having a combined apparent visual magnitude of +4.48. Based upon an annual parallax shift of 2.30 mas as seen from Earth, it is located roughly 1,400 light years from the Sun.
This is a suspected close spectroscopic binary system. The spectrum varies with a periodicity of 28.9 days, and a helium emission component shows a radial velocity variation that matches the period. The properties indicate it may be a φ Per-like system with a Be star primary and a hot subdwarf companion of type sdO. If this is the case, then the pair have a circular orbit with a period that matches the variability. The close-orbiting pair may have undergone interaction in the past, leaving the subdwarf stripped down and the primary star spinning rapidly.
ο Puppis is slightly variable. The General Catalogue of Variable Stars lists it as a possible Be star with a magnitude range of 4.43 - 4.46. The International Variable Star Index classifies it as a Lambda Eridani variable.