Sulphur abundances in disk stars: A correlation with silicon
Abstract
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 [S/Fe] for [Fe/H] >-0.3, below which [S/Fe] increases to ~ 0.25 dex at [Fe/H] =-1.0. We find that there is a good correlation between [S/H] and [Si/H], indicating the same nucleosynthetic origin of the two elements. It seems that the ratio of sulphur to silicon does not depend on metallicity for [Fe/H] > -1.0. The implications of these results on models for the nucleosynthesis of alpha -capture elements and the chemical evolution of the Galaxy are discussed. Based on observations carried out at National Astronomical Observatories (Xinglong, PR China).
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 2002
- DOI:
- 10.1051/0004-6361:20020735
- arXiv:
- arXiv:astro-ph/0206075
- Bibcode:
- 2002A&A...390..225C
- Keywords:
-
- stars: abundances;
- stars: late-type;
- galaxy: evolution;
- Astrophysics
- E-Print:
- 9 pages, 6 figures, accepted by A&