Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..295g&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
Most of the matter in circumstellar shells around red giant stars is in hydrogen and most of this element should be in atomic or molecular form. However, up to now, atomic hydrogen has remained largely undetected due to the weakness of its emission and to the competing emission from interstellar hydrogen on the same line of sight. The low level lines of molecular hydrogen are in the infrared range and difficult to observe from the ground.
With the renovated Nancay Radiotelescope we have undertaken a new search for the atomic hydrogen emission line at 21 cm in the direction of red giants of the first branch, AGB stars and post-AGBs, including PNs. We discuss the difficulties related to the detection of the HI emission from circumstellar shells and present our results on a few illustrative cases.
Bertre Th. Le
Gerard Emmanuelle
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