Sleuthing the Abundance of Helium in Omega Centauri

Details Sleuthing the Abundance of Helium in Omega Centauri Sleuthing the Abundance of Helium in Omega Centauri

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..392d&link_type=abstract

NOAO Proposal ID #2010A-0392

Physics

Scientific paper

The presence of a large helium abundance inhomogeneity in the globular cluster Omega Centauri, signaled by a bifurcation of colors in the middle main sequence, can be tested directly. We propose a measure of the strength of the He I 10830Aabsorption line in stars on the red giant branch of the cluster. Helium absorption occurs in metal- poor stars with T_eff > 4500K both in the field and in the clusters, M4 and M13. PHOENIX spectra of a sample of red giants in Omega Cen can reveal the presence (or not) of a bimodal distribution of helium equivalent widths in a sample of red giants not subject to diffusion or abundance stratification.

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