Sulphur abundances in metal-poor stars
arXiv:astro-ph/0509161 · doi:10.1051/0004-6361:20053569
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.
accepted by A&A, 4 pages, 3 tables, 1 figure; v2: Table2 updated with metallicities from other works
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Cited by in corpus (7)
- Sulphur and zinc abundances in Galactic halo stars revisited
- The Gaia-ESO Survey: Galactic evolution of sulphur and zinc
- Sulphur abundances in halo giants from the [S I] line at 1082 nm and the S I triplet around 1045 nm
- Sulphur abundances in disk stars as determined from the forbidden 10821 A [SI] line
- Sulphur in the Globular Clusters 47 Tucanae and NGC 6752
- Prospects of Stellar Abundance Studies from Near-IR Spectra Observed with the E-ELT
- On the Galactic chemical evolution of sulphur. Sulphur abundances from the [S i] 1082 nm line in giants