Volume 390, Number 1, July IV 2002
|Page(s)||225 - 233|
|Section||Stellar structure and evolution|
|Published online||05 July 2002|
Sulphur abundances in disk stars: A correlation with silicon*
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
2 Institute of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark
3 Uppsala Astronomical Observatory, Box 515, 751 20, Sweden
4 Present address: Research School of Astronomy and Astrophysics, Australian National University, Mount Stromlo Observatory, Cotter Road, Weston, ACT 2611, Australia
Corresponding author: P. E. Nissen, firstname.lastname@example.org
Accepted: 15 May 2002
We have performed new determinations of sulphur and silicon abundances for a sample of 26 disk stars based on high-resolution, high signal-to-noise spectra. The results indicate a solar for , below which increases to ~0.25 dex at . We find that there is a good correlation between and , indicating the same nucleosynthetic origin of the two elements. It seems that the ratio of sulphur to silicon does not depend on metallicity for . The implications of these results on models for the nucleosynthesis of α-capture elements and the chemical evolution of the Galaxy are discussed.
Key words: stars: abundances / stars: late-type / galaxy: evolution
© ESO, 2002
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