| Issue |
A&A
Volume 378, Number 1, October IV 2001
|
|
|---|---|---|
| Page(s) | L29 - L32 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20011250 | |
| Published online | 15 October 2001 | |
Cold H I in IRC +10216
1
DEMIRM, UMR 8540, Observatoire de Paris, 61 av. de l'Observatoire, 75014 Paris, France
2
ARPEGES, UMR 8644, Observatoire de Paris, 5 place J. Janssen, 92195 Meudon Cedex, France e-mail: Eric.Gerard@obspm.fr
Corresponding author: T. Le Bertre, Thibaut.LeBertre@obspm.fr
Received:
13
August
2001
Accepted:
6
September
2001
With the recently refurbished Nançay Radiotelescope we have
observed the H I 21 cm line in the direction of IRC +10216, a typical high
mass-loss carbon star. We found H I in absorption indicating that the
expanding circumstellar gas may reach very low temperatures (
K).
The atomic gas could be the product of the photo-dissociation of molecular
hydrogen in the outer envelope or result from a previous phase
(
years ago) of mass loss when the star had a higher
effective temperature than now.
Key words: stars: circumstellar matter / stars: mass-loss / stars: AGB and post-AGB / radio lines: stars
© ESO, 2001
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