ar X iv : 0 70 8 . 00 96 v 1 [ as tr o - ph ] 1 A ug 2 00 7 Abundances on the Main Sequence of Omega Centauri
نویسنده
چکیده
Abundance ratios of carbon, nitrogen and strontium relative to iron, calculated using spectrum synthesis techniques, are given for a sample of main sequence and turnoff stars that belong to the globular cluster ω Centauri. The variations of carbon, nitrogen and/or strontium show several different abundance patterns as a function of [Fe/H]. The source of the enhancements/depletions in carbon, nitrogen and/or strontium may be enrichment from asymptotic giant branch stars of low (1–3 M⊙) and intermediate (3–8 M⊙) mass. Massive rotating stars which produce excess nitrogen without carbon and oxygen overabundances may also play a role. These abundances enable different contributors to be considered and incorporated into the evolutionary picture of ω Cen. Subject headings: globular clusters: general — globular clusters: individual (ω Centauri)
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