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Issue A&A
Volume 378, Number 1, October IV 2001
Page(s) L29 - L32
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20011250



A&A 378, L29-L32 (2001)
DOI: 10.1051/0004-6361:20011250

Cold H I in IRC +10216

T. Le Bertre1 and E. Gérard2

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

(Received 13 August 2001 / Accepted 6 September 2001 )

Abstract
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 (${\leq}4$ 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 ( ${\geq}6\times 10^{3}$ 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

Offprint request: T. Le Bertre, Thibaut.LeBertre@obspm.fr

SIMBAD Objects



© ESO 2001


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