Sulphur Abundances in Metal-poor Stars

Bibcode
2008psa..conf...51N
DOI
10.1007/978-3-540-75485-5_12
Nissen, P. E.; Akerman, C.; Asplund, M.; Fabbian, D.; Pettini, M.
Bibliographical reference

Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Edited by N.C. Santos, L. Pasquini, A.C.M. Correia, and M. Romanielleo. Garching, Germany, 2008 pp. 51-54

Advertised on:
0
2008
Number of authors
5
IAC number of authors
0
Citations
1
Refereed citations
1
Description
We report on sulphur abundances in halo stars as derived from near-IR UVES spectra. The importance of removing telluric lines and residual CCD fringing patterns by using early B-type stars as calibrators is emphasized. Comparison of data from the weak λ8694.6 and the stronger λ9212.9, 9237.5 pair of S I lines provides important constraints on non-LTE effects. We do not confirm the high sulphur abundances reported by others for some metal-poor stars; our results instead indicate that sulphur behaves like other typical α-capture elements with a plateau at [S/Fe] ˜ +0.3 dex in the Galactic halo.
Type
Non-refereed

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