T Tauri

Database links to T Tauri

Multiple star T Tauri
AladinLite
Observation dates equinox :  J2000.0 , epoch : J2000.0
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
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
Bonn survey BD + 19 ° 706 Henry Draper Catalog HD 284419 [1] Hipparcos catalog HIP 20390 [2] Tycho catalog TYC 1272-470-1 [3] 2MASS catalog 2MASS J04215943 + 1932063 [4] Other names HH 355
annotation
↑ Calculated from apparent brightness and distance.

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

Commons : T Tauri  - Collection of images, videos and audio files

• https://www.aavso.org/vsots_ttau

Individual evidence

1. ↑ ^{a b c d} T Tau. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on October 31, 2018 . 
2. ↑ ^{a b} Hipparcos catalog (ESA 1997)
3. ↑ T dew. In: VSX. AAVSO, accessed October 31, 2018 . 
4. ↑ Pulkovo radial velocities for 35493 HIP stars
5. ↑ http://www.daviddarling.info/encyclopedia/T/T_Tauri.html