Zeta Tauri
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Double star ζ Tauri |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | bull | ||||||||||||||||||||
| Right ascension | 05 h 37 m 38.69 s | ||||||||||||||||||||
| declination | + 21 ° 08 ′ 32.8 ″ | ||||||||||||||||||||
| Apparent brightness | 3.03 (2.80 to 3.17) mag | ||||||||||||||||||||
| Typing | |||||||||||||||||||||
| B − V color index | (−0.19) | ||||||||||||||||||||
| U − B color index | (−0.62) | ||||||||||||||||||||
| R − I index | (−0.09) | ||||||||||||||||||||
| Spectral class | B2 IIIpe | ||||||||||||||||||||
| Variable star type | E / GS + GCAS | ||||||||||||||||||||
| Astrometry | |||||||||||||||||||||
| Radial velocity | (+20 ± 2.5) km / s | ||||||||||||||||||||
| parallax | (7.33 ± 0.82) mas | ||||||||||||||||||||
| distance | approx. 400 ly approx. 140 pc |
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| Proper movement | |||||||||||||||||||||
| Rec. Share: | (1.8) mas / a | ||||||||||||||||||||
| Dec. portion: | (−20.1) mas / a | ||||||||||||||||||||
| Physical Properties | |||||||||||||||||||||
| Dimensions | (11.2 + 0.94) M ☉ | ||||||||||||||||||||
| radius | (5.5 +?) R ☉ | ||||||||||||||||||||
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Other names and catalog entries |
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ζ Tauri ( Zeta Tauri , ζ Tau ) is a Be star in the constellation Taurus . It has a mean apparent magnitude of 3.0 mag and is around 400 light years away. ζ Tauri is a spectroscopic binary star with an orbital period of 133 days.
In historical Chinese astronomy, his proper name is 天 關, Tien Kuan (also Tien Kwan , "the heavenly mountain pass"). Another proper name is Alheka (probably Arabic for "white spot").
As a star close to the ecliptic, ζ Tauri can be covered by the moon and (very rarely) planets.
properties
The system is currently valid coverage changeable . According to the model of massive star 11.2 is M ☉ about 1 AE from companion with a mass similar to the sun . Little is known about the companion at the moment, but it could be spectral class G.
Web links
Individual evidence
- ↑ a b c d e f g h zet Tau. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed August 25, 2018 .
- ↑ a b c d zet Tau. In: VSX. AAVSO, accessed August 25, 2018 .
- ↑ a b c G. H. Schaefer, DR Gies, JD Monnier, ND Richardson, Y. Touhami, M. Zhao, X. Che, E. Pedretti, N. Thureau: Multi-epoch Near-infrared Interferometry of the Spatially Resolved Disk around the Be Star ζ Tau . In: The Astronomical Journal . 140, No. 6, December 2010, pp. 1838-1849. arxiv : 1009.5425 . bibcode : 2010AJ .... 140.1838S . doi : 10.1088 / 0004-6256 / 140/6/1838 .