111 Tauri
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Taurus |
| Right ascension | 05h 24m 25.46380s[1] |
| Declination | +17° 23′ 00.7166″[1] |
| Apparent magnitude (V) | 5.1149[1] |
| Characteristics | |
| Spectral type | F8 V + K5 V[2] |
| U−B color index | −0.05[3] |
| B−V color index | 0.544[1] |
| Variable type | BY Dra[3] |
| Astrometry | |
| Radial velocity (Rv) | +37.8[4] km/s |
| Proper motion (μ) | RA: +251.05[1] mas/yr Dec.: −7.99[1] mas/yr |
| Parallax (π) | 69.51 ± 0.38[1] mas |
| Distance | 46.9 ± 0.3 ly (14.39 ± 0.08 pc) |
| Absolute magnitude (MV) | 3.49 ± 0.06[5] |
| Details | |
| 111 Tau A | |
| Mass | 1.08[5] M☉ |
| Radius | 1.67 ± 0.06[5] R☉ |
| Luminosity | 1.845[6] L☉ |
| Surface gravity (log g) | 4.24[7] cgs |
| Temperature | 6,015[7] K |
| Metallicity [Fe/H] | −0.14[7] dex |
| Rotation | 4.1 days[8] |
| Rotational velocity (v sin i) | 16.0[9] km/s |
| Age | 3.76[10] Gyr |
| Other designations | |
111 Tauri is a wide binary star[2] system in the constellation Taurus. It is located at a distance of about 47 light years from the Sun. Primary component A is a main sequence star with a stellar classification of F8V. The secondary component B (Gliese 201) is a K-type main sequence star.[2] It is larger and more luminous than the Sun, with about 130% of the Sun's radius and 185% of the Sun's luminosity. The apparent magnitude of 5.1 indicates it is a faint star that can be viewed by the naked eye under good, dark-sky conditions.
The metallicity of the primary star, which measures the proportion of elements other than hydrogen and helium, is similar to the Sun. Estimates of [Fe/H], which is the logarithm of the ratio of iron to hydrogen as compared to the Sun, range from a low of −0.14 to a high of 0.05.[7][8] This star shows an unusually high content of Lithium, which remains unexplained.[8] Age estimates for this star range from 3.6 to 3.76 billion years.[4][10] It is a prominent X-ray source.[8]
This star is rotating relatively rapidly, completing a rotation along the equator every 4.1 days as compared to 25 days for the Sun. It is also undergoing differential rotation in which the rotation velocity varies by latitude.[11]
This star was examined for an excess of infrared emission that could indicate it has a circumstellar debris disk of dust, but no significant excess was observed.[10] The space velocity components of this star are [U, V, W] = [−36.94, −14.63, 7.63] km/s.[12] It shares a common proper motion with HIP 25220, an active star with stellar classification K4V. Both stars are members of the Hyades stellar kinematic group of co-moving stars.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 7.2 7.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 8.2 8.3 8.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 10.0 10.1 10.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
