Photochemistry and molecular ions in oxygen-rich circumstellar envelopes

Details Photochemistry and molecular ions in oxygen-rich circumstellar envelopes Photochemistry and molecular ions in oxygen-rich circumstellar envelopes

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..306m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. 306-315.

Astronomy and Astrophysics

Astrophysics

47

Molecular Ions, Oxygen, Photochemical Reactions, Red Giant Stars, Stellar Envelopes, Stellar Models, Cosmic Rays, Interstellar Radiation, Molecular Interactions, Photoionization, Ultraviolet Radiation

Scientific paper

A theory for the ionization of the circumstellar envelopes around O-rich red giants is developed from the photochemical model. The main source of ionization is photoionization of H2O, OH, and C by the interstellar UV radiation field, supplemented by cosmic-ray ionization of hydrogen. Significant amounts of H3O+ and HCO+ are produced, with peak abundances ≡10-7 at intermediate distances from the star. Although H3O+ may be difficult to detect with current instrumentation, HCO+ is probably detectable in nearby O-rich envelopes with large millimeter-wave telescopes.

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