Sulphur abundances in disk stars: A correlation with silicon

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

doi:doi:10.1051/0004-6361:20020735

Free access

Issue		A&A Volume 390, Number 1, July IV 2002


Page(s)		225 - 233
Section		Stellar atmospheres
DOI		http://dx.doi.org/10.1051/0004-6361:20020735

A&A 390, 225-233 (2002)
DOI: 10.1051/0004-6361:20020735

Sulphur abundances in disk stars: A correlation with silicon

Y. Q. Chen^{1, 2}, P. E. Nissen², G. Zhao¹ and M. Asplund^{3, 4}

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

(Received 10 January 2002 / Accepted 15 May 2002 )

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 $\mbox{\rm [S/Fe]}$ for $\mbox{\rm [Fe/H]}>-0.3$ , below which $\mbox{\rm [S/Fe]}$ increases to ~0.25 dex at $\mbox{\rm [Fe/H]}=-1.0$ . We find that there is a good correlation between $\mbox{\rm [S/H]}$ and $\mbox{\rm [Si/H]}$ , indicating the same nucleosynthetic origin of the two elements. It seems that the ratio of sulphur to silicon does not depend on metallicity for $\mbox{\rm [Fe/H]}> -1.0$ . The implications of these results on models for the nucleosynthesis of $\alpha$ -capture elements and the chemical evolution of the Galaxy are discussed.

Key words: stars: abundances -- stars: late-type -- galaxy: evolution

Offprint request: P. E. Nissen, pen@ifa.au.dk

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