Formaldehyde in oxygen-rich circumstellar envelopes

T. J. Millar, H. Olofsson

Research output: Contribution to journalArticlepeer-review


We test the hypothesis that methane is the source of the carbon observed in carbon-bearing molecules around oxygen-rich stars, by considering the synthesis of formaldehyde which is formed in the reaction between oxygen atoms and methyl radicals. We find that, provided that the parent methane abundance is large enough, millimetre-wave emission lines of H2CO should be detectable in such stars. We also consider the formation of other species, notably H2CN and H2CS, from methyl radicals, but conclude that they will be at least one order of magnitude less abundant than H2CO and therefore not detectable with current instrumentation.

Original languageEnglish
Pages (from-to)L55-L58
Number of pages4
JournalMonthly Notices of the Royal Astronomical Society
Publication statusPublished - 1993
Externally publishedYes


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