Marino, Anna; Milone, Antonino; Piotto, G; Cassisi, S; D'Antona, Francesca; Anderson, Jay; Aparicio, A; Bedin, L R; Renzini, Alvio; Villanova, S
We present a chemical-composition analysis of 77 red-giant stars in Omega Centauri. We have measured abundances for carbon and nitrogen, and combined our results with abundances of O, Na, La, and Fe that we determined in our previous work. Our aim is to better understand the peculiar chemical-enrichment history of this cluster by studying how the total C+N+O content varies among the different metallicity stellar groups, and among stars at different places along the Na-O anticorrelation. We find...[Show more]
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