Formaldehyde in oxygen-rich circumstellar envelopes

Details Formaldehyde in oxygen-rich circumstellar envelopes Formaldehyde in oxygen-rich circumstellar envelopes

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262l..55m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 4, p. L55-L58.

Other

11

Formaldehyde, Interstellar Matter, Late Stars, Molecular Spectra, Oxygen, Stellar Envelopes, Line Spectra, Radio Spectra

Scientific paper

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, millimeter-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.

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