On the Origin of Sulfur

Details On the Origin of Sulfur On the Origin of Sulfur

2005-10-05

arxiv.org/abs/astro-ph/0510136v1

ASP Conference Series, Vol. 336, p 355 (2005)

Astronomy and Astrophysics

Astrophysics

In conference proceedings: Cosmic Abundances as Records of Stellar Evolution and Nucleosynthesis in honor of David L. Lambert

Scientific paper

We present our work on the halo evolution of sulfur, based on observations of the S I lines around 9220 A for ten stars for which the S abundance was obtained previously from much weaker S I lines at 8694 A. We cannot confirm the rise and the high [S/Fe] abundances for low [Fe/H], as claimed in the literature from analysis of the 8694 A lines. The reasons for claims of an increase in [S/Fe] with decreasing [Fe/H] are probably twofold: uncertainties in the measurements of the weak 8694 A lines, and systematic errors in metallicity determinations from Fe I lines. The near-infrared sulfur triplet at 9212.9, 9228.1, and 9237.5 A are preferred for an abundance analysis of sulfur for metal-poor stars. Our work was presented in full by Ryde & Lambert (2004).

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