HCN in the inner envelope of {chi} Cygni

Details HCN in the inner envelope of {chi} Cygni HCN in the inner envelope of {chi} Cygni

2000-06-14

arxiv.org/abs/astro-ph/0006188v1

2000A&A...358L...25D

Astronomy and Astrophysics

Astrophysics

4 pages

Scientific paper

We have detected the (0,11c,0)J=3-2 and (0,0,0)J=8-7 transitions of HCN towards the S star {chi} Cygni. The excitation requirements of these transitions are too high to be satisfied in the outer envelope of the star, and the emission must originate within {solar}20 stellar radii, ie. the molecule must be forming close to the star. This conclusion is supported by a model for AGB stars in which molecules including HCN form in a shocked wind close to the stellar surface.

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