IRAS 08544−4431
Variable star in the constellation Vela / From Wikipedia, the free encyclopedia
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IRAS 08544−4431 is a binary system surrounded by a dusty ring in the constellation of Vela. The system contains an RV Tauri variable star and a more massive but much less luminous companion.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Vela |
Right ascension | 08h 56m 14.181s[1] |
Declination | −44° 43′ 10.71″[1] |
Apparent magnitude (V) | 9.01 - 9.19[2] |
Characteristics | |
Spectral type | F3e[3] |
Variable type | RV[2] |
Astrometry | |
Radial velocity (Rv) | +62.5[3] km/s |
Proper motion (μ) | RA: −7.8[1] mas/yr Dec.: +9.5[1] mas/yr |
Parallax (π) | 0.6551 ± 0.0767 mas[4] |
Distance | approx. 5,000 ly (approx. 1,500 pc) |
Orbit[5] | |
Period (P) | 506.0±1.3 d |
Eccentricity (e) | 0.22±0.02 |
Inclination (i) | 20±7.5° |
Argument of periastron (ω) (secondary) | 41.7±6.3° |
Semi-amplitude (K1) (primary) | 87±0.2 km/s |
Details | |
A | |
Mass | 0.65[6] M☉ |
Radius | 75[5] R☉ |
Luminosity | 14,000[5] L☉ |
Surface gravity (log g) | 1.5[7] cgs |
Temperature | 7,250[7] K |
Metallicity [Fe/H] | −0.5[3] dex |
B | |
Mass | 1.15[6] M☉ |
Temperature | 4,000[8] K |
Other designations | |
Database references | |
SIMBAD | data |
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