Sulphur Abundance in Very Metal-poor Stars | Zendy

G. Israelian | Zendy; R. Rébolo | Zendy

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Sulphur Abundance in Very Metal-poor Stars

Author(s) -

G. Israelian,

R. Rébolo

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/323121

Subject(s) - stars , astrophysics , metal , sulfur , physics , abundance (ecology) , spectral line , analytical chemistry (journal) , materials science , chemistry , astronomy , metallurgy , environmental chemistry , fishery , biology

We have obtained high-resolution high signal-to-noise spectra of the SInear-infrared doublet at 8694 A in eight metal-poor stars with metallicities inthe range -0.6 <[Fe/H]< -3.0. Elemental sulphur abundances were derived for sixtargets and upper limits were set for two of the most metal-poor stars in thesample. The sulphur doublet at 8694.62 A has been detected in three stars(HD19445, HD2665 and HD2796) with [Fe/H]< -1.9. Our observations combined withthose available in the literature indicate a monotonic increase of the [S/Fe]ratio as [Fe/H] decreases, reaching values [S/Fe]~0.7-0.8 below [Fe/H]=-2. Wediscuss plausible scenarios for interpretation of these results.Comment: 14 pages, 3 figures, accepted by ApJ Letter

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