Abundances in red giant stars - Carbon and oxygen isotopes in carbon-rich molecular envelopes

Details Abundances in red giant stars - Carbon and oxygen isotopes in carbon-rich molecular envelopes Abundances in red giant stars - Carbon and oxygen isotopes in carbon-rich molecular envelopes

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..367w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 367-382. Sponsorship: Naturvetenskapliga Forskningsra

Other

45

Abundance, Carbon Isotopes, Carbon Stars, Oxygen Isotopes, Red Giant Stars, Stellar Envelopes, Carbon Monoxide, Late Stars, Millimeter Waves, Planetary Nebulae, Radio Spectra, Stellar Spectra

Scientific paper

Millimeter-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.

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