Carbon isotope ratios and lithium abundances in open cluster giants

Details Carbon isotope ratios and lithium abundances in open cluster giants Carbon isotope ratios and lithium abundances in open cluster giants

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..835g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 835-848.

Astronomy and Astrophysics

Astrophysics

166

Carbon Isotopes, Giant Stars, Lithium, Nitrogen, Open Clusters, Abundance, Carbon 12, Carbon 13, Main Sequence Stars, Stellar Atmospheres, Stellar Evolution

Scientific paper

New high-resolution, high S/N spectra of CN lines at 8000 A and Li lines at 6707 A have been obtained for giants in about 20 Galactic open clusters and C-12/C-13 ratios and Li abundances determined for these stars. The ages of the clusters vary from about 50 million years to 5 billion years, and their turn-off masses vary from 1 solar mass to about 6 solar masses. The ages and turn-off masses were determined by fitting theoretical isochrones to the cluster color-magnitude diagrams. Correlation of the isotope ratio and the Li abundances with the cluster turn-off masses indicates the following: (1) the C-12/C-13 ratio increases steeply with the turn-off mass until a mass of approximately 2.2 solar masses when the ratio levels off abruptly to a value near 26; (2) older clusters with turn-off masses lower than about 2.2 solar masses in general exhibit C-12/C-13 ratios that are considerably lower than the theoretically predicted values while those with larger turn-off masses show ratios close to standard predictions; and (3) no strong correlation exists between the Li abundances and the cluster turn-off mass, and the Li abundances in giants are, in general, lower than theoretically predicted values. Various theories to explain the observed abundance trends are discussed.

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