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Abundances in red giant stars - Carbon and oxygen isotopes in carbon-rich molecular envelopesMillimeter-wave observations have been made of isotopically substituted CO toward the envelopes of 11 carbon-rich stars. In every case, C-13O was detected and model calculations were used to estimate the C-12/C-13 abundance ratio. C-17O was detected toward three, and possibly four, envelopes, with sensitive upper limits for two others. The CO-18 variant was detected in two envelopes. New results include determinations of oxygen isotopic ratios in the two carbon-rich protoplanetary nebulae CRL 26688 and CRL 618. As with other classes of red giant stars, the carbon-rich giants seem to be significantly, though variably, enriched in O-17. These results, in combination with observations in interstellar molecular clouds, indicate that current knowledge of stellar production of the CNO nuclides is far from satisfactory.
Document ID
19870062586
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wannier, P. G.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena United States)
Sahai, R.
(Texas, University Austin, United States)
Date Acquired
August 13, 2013
Publication Date
August 1, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 319
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A49860
Funding Number(s)
CONTRACT_GRANT: NSF AST-83-12332
CONTRACT_GRANT: NFR-F-FU-8746-100
Distribution Limits
Public
Copyright
Other

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