Sulphur abundances in disk stars: a correlation with silicon

Y. Q. Chen; P. E. Nissen; G. Zhao; M. Asplund

doi:10.1051/0004-6361:20020735

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Sulphur abundances in disk stars: a correlation with silicon

Y. Q. Chen·P. E. Nissen·G. Zhao·M. Asplund

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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.

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Y. Q. Chen, P. E. Nissen, G. Zhao, M. Asplund. 2002-06-05. Sulphur abundances in disk stars: a correlation with silicon. https://doi.org/10.1051/0004-6361%3A20020735

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