Cold H I in IRC +10216

Details Cold H I in IRC +10216 Cold H I in IRC +10216

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378l..29l&link_type=abstract

Astronomy and Astrophysics, v.378, p.L29-L32 (2001)

Astronomy and Astrophysics

Astrophysics

10

Stars: Circumstellar Matter, Stars: Mass-Loss, Stars: Agb And Post-Agb, Radio Lines: Stars

Scientific paper

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 (<=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 (>=6x 103 years ago) of mass loss when the star had a higher effective temperature than now.

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