METHANOL IN THE CIRCUMSTELLAR ENVELOPE OF IRC-DEGREES-216(10)

Millimeter-wave observations of the extremely carbon-rich circumstella r envelope of IRC +10 degrees 216 show several emission lines that we identify with rotational transitions of methanol. We describe our obse rvations and the reasoning that led to this identification. We argue t hat shock chemistry, ion-molecule reactions, and grain surface reactio ns might all be potential sources of circumstellar methanol. Each of t hese pathways either requires or produces H2O in the envelope of IRC 10 degrees 216.