Carbon Isotopic Abundances in the Red Giants of Omega Centauri (NGC5139)

Verne V. Smith , Donald M. Terndrup , Nicholas B. Suntzeff

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classification 🌌 astro-ph

keywords omegaabundanceabundancescentaurigiantsbandscarboncarbon-12

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Carbon-12 and carbon-13 abundances are measured in eleven red-giant members of the globular cluster Omega Centauri via observations of first-overtone CO bands near 2.3 microns. The mean value for the entire sample is <12C/13C>= 4.3 +/-0.4, with nine giants equal, within the errors, to the equilibrium ration of 12C/13C= 3.5. No correlation is found within Omega Cen between 12C/13C and the abundance of iron. The relation between 12C/13C and other abundance ratios, such as [O/Fe], {Na/Fe], or [Al/Fe] are also discussed.

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Carbon Isotopic Abundances in the Red Giants of Omega Centauri (NGC5139)

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