Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-09-26
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
to be published in the Proceedings of the annual meeting (2011) of the French Astronomical Society (Societe Francaise d'Astron
Scientific paper
The HI line at 21 cm is a tracer of circumstellar matter around AGB stars, and especially of the matter located at large distances (0.1-1 pc) from the central stars. It can give unique information on the kinematics and on the physical conditions in the outer parts of circumstellar shells and in the regions where stellar matter is injected into the interstellar medium. However this tracer has not been much used up to now, due to the difficulty of separating the genuine circumstellar emission from the interstellar one. With the Nancay Radiotelescope we are carrying out a survey of the HI emission in a large sample of evolved stars. We report on recent progresses of this long term programme, with emphasis on S-type stars.
Bertre Th. Le
Gerard Emmanuelle
Libert Yannick
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