Isotopic abundances in carbon-rich circumstellar envelopes - A further iteration on the oxygen isotope puzzle

Details Isotopic abundances in carbon-rich circumstellar envelopes - A further iteration on the oxygen isotope puzzle Isotopic abundances in carbon-rich circumstellar envelopes - A further iteration on the oxygen isotope puzzle

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..235k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 235-250.

Astronomy and Astrophysics

Astrophysics

86

Carbon Stars, Isotope Effect, Line Spectra, Oxygen Isotopes, Stellar Envelopes, Abundance, Carbon Isotopes, Line Shape

Scientific paper

We have detected the (J=1-0) and (J=2-1) lines of the oxygen and carbon isotopomers of CO in five dusty carbon-rich envelopes (CIT6, IRC+10216, CRL618, CRL2688, NGC7027) which represent evolution stages ranging from early AGB to planetary nebula. The C(O-17)/C(O-18) abundance ratios, assumed equal to the elemental O-17/O-18 in the gas phase, are found to be larger than 1 in the last four envelopes; a lower limit of 1 is derived for CIT6. In the five envelopes, we measure C-12/C-13 ratios larger than 30. The O-17/O-18 ratios measured in these five dusty C-rich envelopes appear similar to those obtained from infrared observations in less opaque C-rich and O-rich envelopes, i.e., 4 to 5 times larger than the remarkably constant value observed in the interstellar medium. We argue that AGB stars with C-rich (or translucent O-rich) envelopes cannot be the dominant sources of oxygen (and presumably, more generally, of star processed matter) in the interstellar medium.

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