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

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

2002-07-19

arxiv.org/abs/astro-ph/0207434v1

Astrophys.J. 579 (2002) 832-840

Astronomy and Astrophysics

Astrophysics

16 pages, 3 tables, 7 figures. Accepted in The Astrophysical Journal (scheduled for November 2002)

Scientific paper

10.1086/342921

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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