AA Tauri
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Star AA Tauri |
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| AladinLite | |||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | bull | ||
| Right ascension | 04 h 34 m 55 s | ||
| declination | + 24 ° 28 ′ 53 ″ | ||
| Apparent brightness | 12.5 mag to 16.1 mag; Medium 12.58 mag | ||
| Typing | |||
| B − V color index | +1.17 | ||
| U − B color index | +0.07 | ||
| Spectral class | K7 V | ||
| Variable star type | classic T-Tauri variable | ||
| Astrometry | |||
| Radial velocity | 16.1 ± 2.1 km / s | ||
| distance | approx. 450 ly approx. 140 pc |
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| Proper movement | |||
| Rec. Share: | +14 mas / a | ||
| Dec. portion: | −24 mas / a | ||
| Physical Properties | |||
| Dimensions | approx. 0.8 M ☉ | ||
| radius | (1.85 ± 0.15) R ☉ | ||
| Luminosity |
(0.8 ± 0.1) L ☉ |
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| Effective temperature | (4030 ± 30) K. | ||
| Rotation time | 8.5 d | ||
| Age | approx. 2 million a | ||
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Other names and catalog entries |
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AA Tauri is a fixed star in the constellation Taurus . Its special feature is that in its environment - in accordance with the discovery of J. Carr (according to the journal Science, vol 319, p 1504th) - with the help of the Spitzer Infrared - telescope hydrogen cyanide (prussic acid), acetylene and carbon dioxide and water vapor are detected could. The star thus has a protoplanetary disk made of organic material, in which processes of chemical evolution known from organic chemistry and highly interesting for cosmochemistry take place (see under chemical evolution ). AA Tauri is located in the Taurus-Auriga complex and is part of the T-association Taurus T3 and is associated with the dark cloud Barnard 18, but the star lies outside the dense inner part of the cloud.
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- ^ Center de Données astronomiques de Strasbourg: SIMBAD query for AA Tauri. In: SIMBAD. Retrieved June 2, 2008 .
- ↑ a b c Herbig, GH; Kameswara Rao, N .: Second Catalog of Emission-Line Stars of the Orion Population ; in: Astrophysical Journal, Vol. 174, p. 401, bibcode : 1972ApJ ... 174..401H (English)
- ↑ a b c d e f g h Bouvier et al .: Magnetospheric accretion onto the T Tauri star AA Tauri ; in: Astronomy and Astrophysics, Vol. 349, pp. 619ff. bibcode : 1999A & A ... 349..619B (English)
- ↑ Hartmann, L .; Hewett, R .; Stahler, S .; Mathieu, RD: Rotational and radial velocities of T Tauri stars ; in: Astrophysical Journal, Vol. 309, pp. 275–293, bibcode : 1986ApJ ... 309..275H (English)
- ↑ Jones, BF; Herbig, GH: Proper motions of T Tauri variables and other stars associated with the Taurus-Auriga dark clouds ; in: Astronomical Journal, Vol. 84, pp. 1872–1889, bibcode : 1979AJ ..... 84.1872J (English)