Y Tauri
Variable star in the constellation Taurus
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Y Tauri is a carbon star located in the constellation Taurus. Parallax measurements by Gaia put it at a distance of approximately 2,170 light-years (670 parsecs).[2]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus[1] |
| Right ascension | 05h 45m 39.4101s[2] |
| Declination | +20° 41′ 42.149″[2] |
| Apparent magnitude (V) | 6.5 - 9.2[3] |
| Characteristics | |
| Evolutionary stage | AGB[4][5] |
| Spectral type | C6.5,4e(N3)[3] |
| Variable type | SRb[3] |
| Astrometry | |
| Radial velocity (Rv) | 17.00[6] km/s |
| Proper motion (μ) | RA: 0.039[2] mas/yr Dec.: −4.532[2] mas/yr |
| Parallax (π) | 1.5006±0.0592 mas[2] |
| Distance | 2,170 ± 90 ly (670 ± 30 pc) |
| Absolute magnitude (MV) | −1.1 (near max.)[7] |
| Details | |
| Mass | 4.3[8] M☉ |
| Radius | 219[9] R☉ |
| Luminosity | 6,025[5] L☉ |
| Surface gravity (log g) | 0.228[8] cgs |
| Temperature | 3,217[10] K |
| Metallicity [Fe/H] | −0.106[8] dex |
| Other designations | |
| Y Tau, BD+20°1083, HD 38307, HIP 27181, HR 1977 | |
| Database references | |
| SIMBAD | data |
In the 19th century, Thomas William Webb and John Birmingham noted that Y Tauri might be a variable star. Thomas William Backhouse confirmed that the star's brightness varies, in 1887.[12][13] Y Tauri is a semiregular variable star. Its class is SRb, and its primary pulsation cycle lasts 241.5 days.[3] No long secondary period has been identified.[14] It has a radius of 219 R☉, an effective surface temperature of 3,217 K, and a bolometric luminosity of 4,489 L☉. Its mass is calculated to be 4.3 M☉.
Y Tauri is losing mass at 4×10−7 M☉/yr, and is surrounded by dust at a temperature of 1,900 K.[4]