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We present a chemical abundance analysis of a metal-poor star, ROA 276, inthe stellar system omega Centauri. We confirm that this star has an unusuallyhigh [Sr/Ba] abundance ratio. Additionally, ROA 276 exhibits remarkably highabundance ratios, [X/Fe], for all elements from Cu to Mo along with normalabundance ratios for the elements from Ba to Pb. The chemical abundance patternof ROA 276, relative to a primordial omega Cen star ROA 46, is best fit by afast-rotating low-metallicity massive stellar model of 20 Msun, [Fe/H] = -1.8,and an initial rotation 0.4 times the critical value; no other nucleosyntheticsource can match the neutron-capture element distribution. ROA 276 arguablyoffers the most definitive proof to date that fast-rotating massive starscontributed to the production of heavy elements in the early Universe.

A chemical signature from fast-rotating low-metallicity massive stars: ROA 276 in omega Centauri