Statistics – Computation
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157...35g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 1, March 1986, p. 35-48.
Statistics
Computation
99
Ion Production Rates, Ionic Reactions, Molecular Interactions, Molecular Ions, Stellar Envelopes, Abundance, Computational Astrophysics, Hydrocarbons, Ion Recombination, Spatial Distribution
Scientific paper
Assuming a steady and spherically symmetric mass loss, the spatial distribution of the ionization in a C-rich circumstellar envelope (CSE) is calculated, and it is shown that molecular ions dominate the ionization and chemistry of a large part of the CSE. Cosmic ray ionization of molecular hydrogen yields H3(+), and the photoionization of acetylene and neutral carbon yields C2H2(+) and C(+). In the system, the primary ions generate a series of heavier molecular ions by reactions with neutral molecules before being destroyed by dissociative recombination. The most promising candidate for mm-wavelength detection is found to be HCO(+), and IRC + 10216 antenna temperatures are calculated for different telescope sizes. Photoproduced C2H2(+), the most abundant intermediate distance CSE ion, may be responsible for the synthesis of various heavy hydrocarbon molecules at levels observed in IRC + 10216.
Glassgold Alfred E.
Lucas Robert
Omont Alain
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