Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..611o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 2, May 1991, p. 611-615.
Astronomy and Astrophysics
Astrophysics
31
Mira Variables, Molecular Clouds, Stellar Envelopes, Cyanogen, Oxygen, Stellar Composition, Stars: Circumstellar Matter, Stars: Long-Period Variables, Stars: Mass Loss
Scientific paper
A search for molecules in the envelope of the Mira variable TX Cam has been initiated. As a result the first detection of CN in an oxygen-rich circumstellar envelope was made. It is found that the observed CN/HCN abundance-ratio is clearly inconsistent with existing chemical models. In fact, the low CN/HCN abundance-ratio, which is lower than expected from photodissociation of HCN, may point to a process that destroys CN in an O-rich environment. The observed high HCN-abundance requires a much more efficient mechanism for producing HCN than proposed so far.
Lindqvist M.
Nguyen-Q-Rieu
Nyman L.-AA.
Olofsson Hans
Winnberg Anders
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