Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..279n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 279-286. Research supported by the Nordisk Institut
Astronomy and Astrophysics
Astrophysics
70
Late Stars, Molecular Interactions, Reaction Kinetics, Stellar Composition, Stellar Envelopes, Stellar Models, Carbon Monoxide, Cosmic Rays, Cyanogen, Hydrocyanic Acid, Radiation Effects
Scientific paper
The authors present detailed results of a chemical kinetic model of the outer envelope (1016cm to 1018cm) of the carbon-rich star IRC +10216. The chemistry is driven by a combination of cosmic-ray ionization and ultraviolet radiation and, starting from 7 parent molecules injected into the envelope, the authors find that a complex chemistry ensues. Ion-molecule reactions can efficiently build hydrocarbon species and account for the observed abundances of CH3CN and HNC. Reactions involving CO may lead to observable abundances of oxygen-bearing molecules such as C3O, CH2CO and HCO+.
Millar Thomas J.
Nejad Lida A. M.
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