Lithium in field Am and normal A-F-type stars

Details Lithium in field Am and normal A-F-type stars Lithium in field Am and normal A-F-type stars

2005-11-30

arxiv.org/abs/astro-ph/0511836v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, poster presented at the conference "Element stratification in stars, 40 years of atomic diffusion", eds. G

Scientific paper

10.1051/eas:2005135

Preliminary abundances of lithium and a few other elements have been obtained for 31 field Am stars with good Hipparcos parallaxes, as well as for 36 normal A and F stars. Radial and projected rotational velocities were determined as well. We examine the Li abundance as a function of the stellar parameters: for normal stars, it is clearly bimodal for Teff < 7500 K, while Am-Fm stars are all somewhat Li-deficient in this range. The most Li-deficient stars - either Am or normal - tend to be at least slightly evolved, but the reverse is not true.

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