Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...180..183g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 180, no. 1-2, June 1987, p. 183-190.
Astronomy and Astrophysics
Astrophysics
56
Carbon, Interstellar Chemistry, Molecular Ions, Photochemical Reactions, Stellar Envelopes, Abundance, Cool Stars, Hydrocyanic Acid, Reaction Kinetics, Spatial Distribution, Stellar Models
Scientific paper
The authors' earlier theory of ionization of C-rich circumstellar envelopes based on the photochemical model is extended to include the temperature dependence of ion-molecule reactions with polar molecules, particularly HCN, and line self-shielding of CO dissociating radiation. The results are applied to the abundances of HCO+ and HNC in C-rich circumstellar envelopes. With standard parameters for IRC +10216, the model is found to be consistent with the new upper limit to the antenna temperature of the J = 1-0 line of HCO+ obtained with the IRAM 30-m telescope. The photochemical model provides a natural explanation of the relatively large ratio of HCN to HNC observed for C-rich circumstellar envelopes, and good agreement is obtained for the H13CN/HNC antenna temperature ratio measured for IRC +10216.
Glassgold Alfred E.
Lucas Robert
Mamon Gary A.
Omont Alain
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