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We present a chemical-composition analysis of 77 red-giant stars in OmegaCentauri. We have measured abundances for carbon and nitrogen, and combined ourresults with abundances of O, Na, La, and Fe that we determined in our previouswork. Our aim is to better understand the peculiar chemical-enrichment historyof this cluster, by studying how the total C+N+O content varies among thedifferent-metallicity stellar groups, and among stars at different places alongthe Na-O anticorrelation. We find the (anti)correlations among the lightelements that would be expected on theoretical ground for matter that has beennuclearly processed via high-temperature proton captures. The overall[(C+N+O)/Fe] increases by 0.5 dex from [Fe/H] -2.0 to [Fe/H] -0.9. Our resultsprovide insight into the chemical-enrichment history of the cluster, and themeasured CNO variations provide important corrections for estimating therelative ages of the different stellar populations.

astrophysical journal/the astrophysical journal

The C+N+O abundance of Omega Centauri giant stars: implications on the  chemical enrichment scenario and the relative ages of different stellar  populations