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Star in the constellation Vela From Wikipedia, the free encyclopedia
HY Velorum is a binary star[7] system in the southern constellation of Vela. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.83.[5] The distance to this system, as estimated from its annual parallax shift of 7.1 mas,[2] is 460 light years. HY Vel most likely forms a gravitationally bound pair with the magnitude 5.45 binary system KT Vel (HD 74535);[12] both are members of the IC 2391 open cluster.[13] As of 1998, HY Vel and KT Vel had an angular separation of 76.1″ along a position angle of 311°.[14]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vela |
Right ascension | 08h 42m 25.38667s[2] |
Declination | −53° 06′ 50.3324″[2] |
Apparent magnitude (V) | 4.81 - 4.86[3] |
Characteristics | |
Spectral type | B3 IV[4] |
B−V color index | −0.173±0.007[5] |
Variable type | SPB[3] |
Astrometry | |
Radial velocity (Rv) | +15.6±0.2[5] km/s |
Proper motion (μ) | RA: −24.83[6] mas/yr Dec.: +23.21[6] mas/yr |
Parallax (π) | 7.1141 ± 0.2302 mas[2] |
Distance | 460 ± 10 ly (141 ± 5 pc) |
Absolute magnitude (MV) | −1.25[5] |
Orbit[7] | |
Period (P) | 8.378±0.001 d |
Eccentricity (e) | 0.24±0.04 |
Periastron epoch (T) | 2450741.3 ± 0.2 HJD |
Argument of periastron (ω) (secondary) | 93±9° |
Semi-amplitude (K1) (primary) | 8.0±0.3 km/s |
Details | |
HY Vel Aa | |
Mass | 5.4[8] M☉ |
Luminosity | 830+927 −743[8] L☉ |
Surface gravity (log g) | 4.07[9] cgs |
Temperature | 16,865+235 −231[8] K |
Metallicity [Fe/H] | 0.03±0.02[9] dex |
Rotational velocity (v sin i) | 45[8] km/s |
Age | 179[10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is a single-lined spectroscopic binary system with an orbital period of 8.4 days and an eccentricity of 0.24. The visible component has an a sin i value of 0.006 AU, where a is the semimajor axis and i is the (unknown) orbital inclination to the line of sight.
The primary is a slowly pulsating B-type star having at least three pulsational modes, with the dominant mode showing a frequency of 0.64472 cycles per day,[7] corresponding to the catalogued period of 1.55106 days.[3] It has a stellar classification of B3 IV, matching a B-type subgiant star.[4]
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