Behavior of Sulfur Abundances in Metal-Poor Giants and Dwarfs

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  • 28 March 2001
Abstract
LTE and NLTE abundances of sulfur in metal-poor 6 giants and 61 dwarfs were explored in the range of -3<~ [Fe/H] <~ +0.5 using high-resolution, high signal-to-noise ratio spectra of S I 8693.9 A and 8694.6 A lines observed by us and data measured by Francois (1987, 1988) and Clegg et al. (1981). NLTE effects in S abundances are found to be small and practically negligible. The behavior of [S/Fe] vs. [Fe/H] is revealed to show an increase trend without plateau with decreasing [Fe/H]. The slope of linear increase trend is steeper in halo population than in disk population, and changes at [Fe/H] of about -1. The observed behavior of S may require chemical evolution models of the Galaxy, in which senarios of hypernovae nucleosynthesis and/or time-delayed deposition into interstellar medium grains are incorporated.

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