Issue |
A&A
Volume 390, Number 1, July IV 2002
|
|
---|---|---|
Page(s) | 225 - 233 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20020735 | |
Published online | 05 July 2002 |
Sulphur abundances in disk stars: A correlation with silicon*
1
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, pen@ifa.au.dk
Received:
10
January
2002
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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