Photochemistry and molecular ions in oxygen-rich circumstellar envelopes
1987; IOP Publishing; Volume: 323; Linguagem: Inglês
10.1086/165828
ISSN1538-4357
AutoresG. A. Mamon, A. E. Glassgold, A. Omont,
Tópico(s)Silicone and Siloxane Chemistry
Resumoview Abstract Citations (57) References (63) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Photochemistry and Molecular Ions in Oxygen-rich Circumstellar Envelopes Mamon, G. A. ; Glassgold, A. E. ; Omont, A. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1987 DOI: 10.1086/165828 Bibcode: 1987ApJ...323..306M Keywords: Molecular Ions; Oxygen; Photochemical Reactions; Red Giant Stars; Stellar Envelopes; Stellar Models; Cosmic Rays; Interstellar Radiation; Molecular Interactions; Photoionization; Ultraviolet Radiation; Astrophysics; MOLECULAR PROCESSES; STARS: CIRCUMSTELLAR SHELLS; STARS: LATE-TYPE full text sources ADS | data products SIMBAD (5)
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