Abstract
Chemical reaction models do not predict appreciable amounts of hydrogen cyanide (HCN) in oxygen rich [O]>[C] circumstellar envelopes. Recently, two detections of HCN in oxygen–rich envelopes have been reported1. Here we report the first detection of HCN in the oxygen–rich evolved star IRC + 10420. This star has been classified as an F8 supergiant and is considered by many to be in transition between a red giant star and a planetary nebula. Its circumstellar envelope may be in a more advanced stage of chemical evolution than red giant envelopes.
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