Oxygen isotopic abundances in the atmospheres of seven red giant stars

Details Oxygen isotopic abundances in the atmospheres of seven red giant stars Oxygen isotopic abundances in the atmospheres of seven red giant stars

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..674h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 674-682. Research supported by the Robert A. Welch F

Other

87

Abundance, Nuclear Fusion, Oxygen Isotopes, Red Giant Stars, Stellar Atmospheres, Stellar Composition, Carbon Isotopes, Stellar Cores, Stellar Envelopes, Stellar Evolution, Stellar Spectra

Scientific paper

Theoretical arguments and observations indicate that on joining the red giant branch all stars undergo a dredge-up process which brings to the surface material which underwent CN-cycle reaction during the preceding main-sequence evolution. The stars' atmospheres are thus enriched in, for example, C-13 and N-14, Harris and Lambert (1984) have shown that measurements of O-17 and O-18 abundances in the red supergiants Alpha Ori and Alpha Sco may constrain explanations of the low C-12/C-13 ratios observed in these stars. The present investigation is concerned with an extension of this analysis to seven other red giants of lower mass. The considered stars cover a range of spectral types from K1 to M5, and include the metal-poor low-mass object Alpha Boo. The results obtained for the seven red giants and the data of Harris and Lambert for the two red supergiants, show that the O-16/O-18 ratios in these stars are consistent with the solar system and local interstellar values.

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