Abundances on the Main Sequence of Omega Centauri
Abstract
Abundance ratios of carbon, nitrogen and strontium relative to iron, calculated using spectrum synthesis techniques, are given for a sample of main sequence and turnoff stars that belong to the globular cluster omega Centauri. The variations of carbon, nitrogen and/or strontium show several different abundance patterns as a function of [Fe/H]. The source of the enhancements/depletions in carbon, nitrogen and/or strontium may be enrichment from asymptotic giant branch stars of low (1--3 solar masses) and intermediate (3--8 solar masses) mass. Massive rotating stars which produce excess nitrogen without carbon and oxygen overabundances may also play a role. These abundances enable different contributors to be considered and incorporated into the evolutionary picture of omega Cen.
Cite
@article{arxiv.0708.0096,
title = {Abundances on the Main Sequence of Omega Centauri},
author = {Laura M. Stanford and G. S. Da Costa and John E. Norris},
journal= {arXiv preprint arXiv:0708.0096},
year = {2009}
}
Comments
43 Pages, 13 Figures. Accepted for publication in ApJ