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Photochemistry and molecular ions in oxygen-rich circumstellar envelopesA 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 of about 10 to the -7th 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.
Document ID
19880033174
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mamon, G. A.
(New York Univ. New York, NY, United States)
Glassgold, A. E.
(New York University NY, United States)
Omont, A.
(Grenoble Observatoire, Saint-Martin-d'Heres, France)
Date Acquired
August 13, 2013
Publication Date
December 1, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 323
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A20401
Funding Number(s)
CONTRACT_GRANT: NAGW-630
Distribution Limits
Public
Copyright
Other

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