The chemical composition of red giants. III - Further CNO isotopic and s-process abundances in thermally pulsing asymptotic giant branch stars

Details The chemical composition of red giants. III - Further CNO isotopic and s-process abundances in thermally pulsing asymptotic giant branch stars The chemical composition of red giants. III - Further CNO isotopic and s-process abundances in thermally pulsing asymptotic giant branch stars

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...72..387s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 72, Feb. 1990, p. 387-416. Research supported by the Robert A. We

Astronomy and Astrophysics

Astrophysics

268

Asymptotic Giant Branch Stars, Infrared Spectra, Red Giant Stars, Stellar Composition, Stellar Oscillations, Stellar Spectra, Chemical Composition, Heavy Elements, Near Infrared Radiation

Scientific paper

Near-IR and IR spectra are analyzed to obtain elemental and isotopic C, N, and O abundance, iron peak abundances, and heavy element s-process abundances for a sample of M, MS, and S giants. The compositions of the M giants are similar to those of G and K giants and consistent with predictions for giants that have deep convective envelopes and so have experienced the first dredge-up. The MS and S giants have compositions that show the signatures of the third dredge-up that occurs in thermally pulsing AGB stars. The sample shows that C-12, a principal product of the He-burning shell, has been added to the envelopes of MS and S stars. The C-12 enrichment is correlated with a more marked enrichment of the s-process elements that are predicted to be synthesized when a neutron source is ignited in the He-burning shell. The MS and S giants show a higher N abundance than the M giants, attributed to the expected deep mixing that occurs with the onset of the episodic third dredge-up.

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