Chemical Abundances for F and G Luminosity Class II Stars

Details Chemical Abundances for F and G Luminosity Class II Stars Chemical Abundances for F and G Luminosity Class II Stars

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2425l&link_type=abstract

Astronomical Journal v.110, p.2425

Astronomy and Astrophysics

Astronomy

39

Stars: Abundances, Stars: Evolution

Scientific paper

Stellar parameters and abundances for a sample of 38 F/U field bright giants have been determined based on high-resolution and high signal-to-noise KPNO coudé spectra. This study was designed to complement CNO abundance studies of supergiants and giants which bracket the present stars in mass. The pertinent results of the present study are: • The bright giants have [Fe/H] ratios which are solar and are in good agreement with the [Fe/H] ratios found in supergiants and giants • The lithium abundances are diluted in most stars with respect to the canonical interstellar disk value and the lithium abundances correlate with effective temperature. • The CNO abundances of all of the stars show the effects of nuclear processing though to different degrees: the stars are carbon deficient and nitrogen enhanced. • The [O/Fe] ratio in these stars in subsolar with an average value of ˜-0.3 dex. The [0/Fe] ratio correlates with the [C/Fe] ratio. All of these effects are also present in the Li and CNO abundances of supergiants and giants. The implication of these results is that the standard model of stellar mixing is deficient and that new evolutionary models are needed incorporating such effects as rotationally driven mixing and diffusion.

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