RV Tauri
RV Tauri (RV Tau) is a star in the constellation Taurus. It is a yellow supergiant and is the prototype of a class of pulsating variables known as RV Tauri variables. It is a post-AGB star and a spectroscopic binary about 4,700 light years away.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 47m 6.7281s |
| Declination | 26° 10′ 45.613″ |
| Apparent magnitude (V) | 9.0–10.6 |
| Characteristics | |
| Evolutionary stage | Post-AGB |
| Spectral type | G2eIa-M2Ia |
| U−B color index | 0.9-1.8 |
| B−V color index | 1.5-1.9 |
| Variable type | RVb |
| Astrometry | |
| Radial velocity (Rv) | 32 km/s |
| Proper motion (μ) | RA: 1.557 mas/yr Dec.: −4.717 mas/yr |
| Parallax (π) | 0.6926 ± 0.0605 mas |
| Distance | 4,700 ± 400 ly (1,400 ± 100 pc) |
| Absolute magnitude (MV) | −3.359 |
| Orbit | |
| Period (P) | 1,198±17 d |
| Semi-major axis (a) | 1.5 AU |
| Eccentricity (e) | 0.5±0.1 |
| Inclination (i) | 71±8° |
| Semi-amplitude (K1) (primary) | 14.5±1.6 km/s |
| Details | |
| A | |
| Mass | 0.53 M☉ |
| Radius | 83.4±12.8 R☉ |
| Luminosity | 2,800 L☉ |
| Surface gravity (log g) | 0.6 cgs |
| Temperature | 4,810±200 (4,225-5,080) K |
| Metallicity | −0.3±0.2 |
| B | |
| Mass | 0.7±0.1 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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