Carbon, nitrogen, sulfur and silicon isotopic ratios in the envelope of IRC + 10216

Details Carbon, nitrogen, sulfur and silicon isotopic ratios in the envelope of IRC + 10216 Carbon, nitrogen, sulfur and silicon isotopic ratios in the envelope of IRC + 10216

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...190..167k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 190, no. 1-2, Jan. 1988, p. 167-177.

Astronomy and Astrophysics

Astrophysics

60

Carbon Isotopes, Carbon Stars, Nitrogen Isotopes, Silicon Isotopes, Stellar Envelopes, Sulfur Isotopes, Interstellar Matter, Nuclear Fusion

Scientific paper

Using high sensitivity observations of optically thin lines, made at 2 mm and 3 mm with the IRAM 30 m telescope, a redetermination has been made of the carbon, sulfur, and silicon elemental isotopic ratios in the envelope of the carbon star IRC + 10216. Except for (N-14)/(N-15), which was estimated only from H(C-13)N and HC(N-15) observations, each ratio was derived from two or three different molecules; in all cases, the molecular isotopic ratios were found to be consistent. The silicon and sulfur isotopic ratios are found to be very close to their solar system values. The carbon (C-12)/(C-13) ratio is smaller than the terrestrial elemental ratio by almost exactly a factor of 2. (N-15) is underabundant relative to (N-14) by at least a factor of 15. These carbon and nitrogen ratios reflect the isotopic enrichments expected for a late-type star.

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