Carbon-bearing molecules in the envelopes around oxygen-rich stars - First detection of formaldehyde in an oxygen-rich circumstellar envelope

Details Carbon-bearing molecules in the envelopes around oxygen-rich stars - First detection of formaldehyde in an oxygen-rich circumstellar envelope Carbon-bearing molecules in the envelopes around oxygen-rich stars - First detection of formaldehyde in an oxygen-rich circumstellar envelope

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...263..183l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 263, no. 1-2, p. 183-189.

Astronomy and Astrophysics

Astrophysics

35

Carbon, Interstellar Chemistry, Oxygen, Planetary Nebulae, Stellar Composition, Stellar Envelopes, Abundance, Carbon Monoxide, Formaldehyde, Hydrocyanic Acid, Stellar Evolution, Stellar Spectra

Scientific paper

We have detected formaldehyde in the envelope of the candidate protoplanetary nebula OH231.8+4.2. This is the first detection of H2CO in an oxygen-rich circumstellar envelope. The abundance of H2CO is estimated to be about 10 times lower than that of HCN for this object. We also report five new detections of HCN towards oxygen-rich circumstellar envelopes. The total number of published detections has now reached 19, indicating that HCN is a fairly common species in this type of envelope, but at a considerably lower abundance than in the envelopes of carbon stars. The estimated abundances of HCN indicate a need for a more efficient way or producing HCN in oxygen-rich envelopes than has been proposed so far.

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