Theta1 Tauri

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Double star
Theta1 Tauri
The Hyades with θ1 Tauri in the middle
The Hyades with θ 1 Tauri in the middle
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation bull
Right ascension 04 h 28 m 34.5 s
declination + 15 ° 57 ′ 43.8 ″
Apparent brightness 3.84 likes
Typing
B − V color index +0.94 
U − B color index +0.73 
Spectral class K0 IIIb
Astrometry
Radial velocity (38.79 ± 0.45) km / s
parallax (21.13 ± 0.27)  mas
distance (154 ± 2)  ly
(47)  pc
Visual absolute brightness M vis (+0.42) mag
Proper movement 
Rec. Share: (104.97 ± 0.35)  mas / a
Dec. portion: (−15.14 ± 0.21)  mas / a
Physical Properties
Dimensions (2.91 ± 0.88 / 1.31 ± 0.14)  M ☉
radius (11.7 ± 0.2)  R ☉
Luminosity

(75)  L ☉

Effective temperature (4811 ± 50)  K.
Metallicity [Fe / H] (+0.13)
Other names
and catalog entries
Bayer name θ 1 Tauri
Flamsteed name 77 Tauri
Bonn survey BD + 15 ° 631
Bright Star Catalog HR 1411 [1]
Henry Draper Catalog HD 28307 [2]
Hipparcos catalog HIP 20885 [3]
SAO catalog SAO 93955 [4]
Tycho catalog TYC 1265-1170-1 [5]
2MASS catalog 2MASS J04283447 + 1557437 [6]

θ 1 Tauri ( Theta1 Tauri ) is a star system 154 light-years away in the constellation Taurus and is part of the Hyades . The star is a component of the visual binary star Theta Tauri . Since the two components θ 1 Tauri and θ 2 Tauri are about 3 light years apart, they are not considered to be a gravitationally bound system, although the question has not yet been finally clarified. Theta Tauri itself acts as an eye checker , i.e. H. the θ 1 tau and θ 2 tau can already be separated from each other with bare eyes .

properties

θ 1 Tauri itself is a spectroscopic binary star . The two stars (components a and b) orbit each other at a distance of about 10 AU and need a little over 16 years for one orbit.

Web links

Individual evidence

  1. ↑ a b c d e f g h tet01 Tau. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on August 3, 2018 .
  2. ↑ Erika Böhm-Vitense, Kenneth G. Carpenter, Richard D. Robinson: Ultraviolet Emission Lines in BA and Non-BA Giants . In: The Astrophysical Journal . 545, No. 2, December 2000, pp. 992-999. bibcode : 2000ApJ ... 545..992B . doi : 10.1086 / 317850 .
  3. ↑ a b Guillermo Torres, Robert P. Stefanik, David W. Latham: The Hyades Binaries θ 1 Tauri and θ 2 Tauri: The Distance to the Cluster and the Mass ‐ Luminosity Relation . In: The Astrophysical Journal . 485, 1997, p. 167. bibcode : 1997ApJ ... 485..167T . doi : 10.1086 / 304422 .
  4. ↑ a b Boyajian, Tabetha S .: Angular Diameters of the Hyades Giants Measured with the CHARA array . In: The Astrophysical Journal . 691, No. 2, February 2009, pp. 1243-1247. arxiv : 0810.2238 . bibcode : 2009ApJ ... 691.1243B . doi : 10.1088 / 0004-637X / 691/2/1243 .
  5. ^ A b E. Anderson, Ch. Francis: XHIP: An extended hipparcos compilation . In: Astronomy Letters . 38, No. 5, 2012, p. 331. arxiv : 1108.4971 . bibcode : 2012AstL ... 38..331A . doi : 10.1134 / S1063773712050015 .
  6. ↑ a b XHIP in VizieR. Retrieved August 3, 2018 .