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Letter to the Editor
HCN in the inner envelope of Cygni
Received 6 March 2000 / Accepted 9 May 2000
We have detected the and transitions of HCN towards the S star 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 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.
Key words: stars: AGB and post-AGB stars: circumstellar matter stars: individual: O Cyg submillimeter
Send offprint requests to: J.Hatchell@umist.ac.uk
Online publication: June 8, 2000