T Tauri
Multiple star T Tauri |
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AladinLite | |||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | bull | ||||||||||||
Right ascension | 04 h 21 m 59.43 s | ||||||||||||
declination | + 19 ° 32 ′ 6.4 ″ | ||||||||||||
Apparent brightness | 9.81 (9.3 to 13.5) mag | ||||||||||||
Typing | |||||||||||||
Spectral class | K0 IIIe | ||||||||||||
Variable star type | INT | ||||||||||||
Astrometry | |||||||||||||
Radial velocity | (23.9 ± 1.5) km / s | ||||||||||||
parallax | (7.19 ± 0.30) mas | ||||||||||||
distance | (450 ± 20) ly (140) pc |
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Visual absolute brightness M vis | +3.50 mag | ||||||||||||
Proper movement | |||||||||||||
Rec. Share: | (11.60 ± 0.12) mas / a | ||||||||||||
Dec. portion: | (−13.52 ± 0.08) mas / a | ||||||||||||
Physical Properties | |||||||||||||
Other names and catalog entries |
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T Tauri (short: T Tau ) is a variable star in the constellation Taurus . He is the prototype of the T-Tauri stars .
T Tauri was discovered by John Russell Hind in 1852 . Seen from Earth, it appears between the stars of the Open Star Cluster of the Hyades , not far from ε Tauri , but is in reality much further away at around 580 light years. The leading "T" in the name follows the rules for naming variable stars and states that T Tauri is the third variable star discovered in the constellation Taurus. Its apparent brightness varies irregularly between 9.3 and 13.5 mag.
Like all T Tauri stars, T Tauri is also young, only a few million years old. It is related to the reflection nebula NGC 1554-1555 ( Hindscher Nebel , vdB 28), which varies its brightness noticeably.
Recent studies suggest that the system is a triple system . The brightest component T Tauri N therefore has the two companions T Tauri Sa and T Tauri Sb .
literature
- Rainer Köhler: T Tauri - the young three-star. An atypical prototype. In: Stars and Space . Vol. 49, No. 6, 2010, ISSN 0039-1263 , pp. 38-46 ( PDF; 2.0 MB ).
Web links
Individual evidence
- ↑ a b c d T Tau. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on October 31, 2018 .
- ↑ a b Hipparcos catalog (ESA 1997)
- ↑ T dew. In: VSX. AAVSO, accessed October 31, 2018 .
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ http://www.daviddarling.info/encyclopedia/T/T_Tauri.html