EAS Publications Series
Volume 17, 2005Element Stratification in Stars: 40 Years of Atomic Diffusion
|Page(s)||333 - 336|
|Published online||13 January 2006|
G. Alecian, O. Richard and S. Vauclair (eds)
EAS Publications Series, 17 (2005) 333-336
Lithium in field Am and normal A–F-type stars
Laboratoire d'Astrophysique de l'École Polytechnique Fédérale
de Lausanne (EPFL), Observatoire,
1290 Sauverny, Switzerland
2 Formerly at the (now obsolete) Institut d'Astronomie de l'Université de Lausanne, 1290 Chavennes-des-Bois, Switzerland
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.
© EAS, EDP Sciences, 2005
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