Behavior of Sulfur Abundances in Metal-Poor Giants and Dwarfs

K. Sadakane; L. Lu; M. Takada-Hidai; S. Honda; S. Kawanomoto; S. Sato; T.A. Barlow; W.L.W. Sargent; Y. Takeda

Behavior of Sulfur Abundances in Metal-Poor Giants and Dwarfs

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arxiv astro-ph/0103481 v2 pith:BHISDE47 submitted 2001-03-28 astro-ph

Behavior of Sulfur Abundances in Metal-Poor Giants and Dwarfs

M. Takada-Hidai , Y. Takeda , S. Sato , S. Honda , K. Sadakane , S. Kawanomoto , W.L.W. Sargent , L. Lu

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T.A. Barlow

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LTE and NLTE abundances of sulfur in 6 metal-poor giants and 61 dwarfs (62 dwarfs, including the Sun) were explored in the range of -3 \lsim [Fe/H] \lsim $+0.5$ using high-resolution, high signal-to-noise ratio spectra of the \SI 8693.9 \AA and 8694.6 \AA lines observed by us and 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] exhibits a linear increasing trend without plateau with decreasing [Fe/H]. Combining our results with those available in the literature, we find that the slope of the increasing trend is -0.25 in the NLTE behavior of [S/Fe], which is comparable to that observed in [O/Fe]. The observed behavior of S may require chemical evolution models of the Galaxy, in which scenarios of hypernovae nucleosynthesis and/or time-delayed deposition into interstellar medium are incorporated.

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