HD 83058
Binary star system in the constellation Vela From Wikipedia, the free encyclopedia
HD 83058 is a subgiant star in the constellation Vela and a spectroscopic binary. It is visible to the naked eye with an apparent visual magnitude of 5.0. Based upon an annual parallax shift of 3.4254 mas, it is located 950 light-years from the Sun. The system is moving further away with a heliocentric radial velocity of +35 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 09h 34m 08.793s[1] |
| Declination | −51° 15′ 18.95″[1] |
| Apparent magnitude (V) | 5.00[2] |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | B2 IV[3] |
| U−B color index | −0.97[2] |
| B−V color index | −0.19[2] |
| Astrometry | |
| Radial velocity (Rv) | +16.5±3.0[4] km/s |
| Proper motion (μ) | RA: −130.55[1] mas/yr Dec.: +42.98[1] mas/yr |
| Parallax (π) | 3.4252 ± 0.1907 mas[1] |
| Distance | 950 ± 50 ly (290 ± 20 pc) |
| Absolute magnitude (MV) | −2.84[2] |
| Details | |
| primary | |
| Mass | 9.3[5] M☉ |
| Radius | 5.405[6] R☉ |
| Luminosity | 2,686[6] L☉ |
| Surface gravity (log g) | 3.779[6] cgs |
| Temperature | 17,887[6] K |
| Rotational velocity (v sin i) | 64±2[4] km/s |
| Age | 14.1[5] Myr |
| secondary | |
| Rotational velocity (v sin i) | 24±2[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 83058 has generally been considered to be a single star,[8] but high-resolution spectra show it to be a double-lined spectroscopic binary.[9] The two components have approximately the same spectral type.[4] Line-profile variations have been detected which suggest that at least one component pulsates, as is common for stars of this spectral class.[10]
HD 83058 was proposed as a runaway star from a supernova explosion. However, the discovery that it is a binary makes this unlikely.[4]
References
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