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Sulphur abundances in metal-poor stars | | Andreas J. Korn
; Nils Ryde
; | | Date: |
7 Sep 2005 | | Subject: | astro-ph | | Affiliation: | Uppsala Astronomical Observatory, Sweden | | Abstract: | We investigate the debated "sulphur discrepancy" found among metal-poor stars of the Galactic halo with [Fe/H] < -2. This discrepancy stems in part from the use of two different sets of sulphur lines, the very weak triplet at 8694-95 A and the stronger triplet lines at 9212 - 9237 A. For three representative cases of metal-poor dwarf, turnoff and subgiant stars, we argue that the abundances from the 8694-95 lines have been overestimated which has led to a continually rising trend of [S/Fe] as metallicity decreases. Given that the near-IR region is subject to CCD fringing, these weak lines become excessively difficult to measure accurately in the metallicity regime of [Fe/H] < -2. Based on homogeneously determined spectroscopic stellar parameters, we also present updated [S/Fe] ratios from the 9212-9237 lines which suggest a plateau-like behaviour similar to that seen for other alpha elements. | | Source: | arXiv, astro-ph/0509161 | | Services: | Forum | Review | PDF | Favorites | |
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