71 Tauri
Star in the constellation Taurus
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71 Tauri is a suspected triple star[9] system in the zodiac constellation Taurus, located 152 light years from the Sun.[1] It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of +4.48.[2] The star is moving further away from the Earth with a heliocentric radial velocity of +38 km/s.[5] It is a member of the Hyades open cluster.[10]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 26m 20.77082s[1] |
| Declination | +15° 37′ 05.8841″[1] |
| Apparent magnitude (V) | +4.48[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F0 V[3] |
| U−B color index | +0.13[2] |
| B−V color index | +0.25[2] |
| Variable type | δ Sct[4] |
| Astrometry | |
| Radial velocity (Rv) | +38.3[5] km/s |
| Proper motion (μ) | RA: +87.435[1] mas/yr Dec.: −20.978[1] mas/yr |
| Parallax (π) | 21.3957±0.2511 mas[1] |
| Distance | 152 ± 2 ly (46.7 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.10[6] |
| Details | |
| Mass | 1.94[6] M☉ |
| Radius | 3.34[3] R☉ |
| Surface gravity (log g) | 3.73[7] cgs |
| Temperature | 7,543[3] K |
| Rotation | 14.2[6] d |
| Rotational velocity (v sin i) | 192[6] km/s |
| Age | 966[7] Myr |
| Other designations | |
| 71 Tau, V777 Tau, BD+15°625, GC 5375, HD 28052, HIP 20713, HR 1394, SAO 93932[8] | |
| Database references | |
| SIMBAD | data |
The primary component is an F-type main-sequence star with a stellar classification of F0 V.[3] In 1979, Stephen Horan discovered that 71 Tauri is a variable star.[12] It was given its variable star designation, V777 Tauri, in 1981.[13] It is a Delta Scuti variable with an amplitude of 0.02 in magnitude and a frequency of 0.16 d−1.[4] This star has about 1.94[6] times the mass of the Sun and 3.34[3] times the Sun's radius. It has a projected rotational velocity of 192 km s−1, for an estimated rotation period of 14.2 days.[6] Extreme ultraviolet flares have been observed coming from this star's hot corona,[3] and it is the second brightest X-ray source in the Hyades.[10]