Molecular abundances in IRC plus 10216

Details Molecular abundances in IRC plus 10216 Molecular abundances in IRC plus 10216

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106..201l&link_type=abstract

Astronomy and Astrophysics, vol. 106, no. 2, Feb. 1982, p. 201-213.

Astronomy and Astrophysics

Astrophysics

132

Abundance, Carbon Stars, Infrared Stars, Molecular Spectra, Stellar Envelopes, Chemical Reactions, Cosmochemistry, Grain Boundaries, Photodissociation, Radicals, Radio Spectra, Thermodynamic Equilibrium

Scientific paper

The investigation concerns the main chemical process at work in IRC plus 10216 and possibly in other carbon objects and the extent to which the molecular abundances can be predicted. It is pointed out that the situation is more complex than for the oxygen shells. It is thought that the formation processes of the nearly 20 molecules observed in IRC plus 10216 can be classified in four categories of approximately equal importance, each of which is discussed. They are (1) 'freezing' of LTE abundances, (2) non-LTE gas reactions, (3) grain processes, and (4) photodissociation. Also discussed are the principal characteristics of the envelope of IRC plus 10216. The abundances inferred from the observations are critically reviewed.

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