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A chemical signature from fast-rotating low-metallicity massive stars: ROA 276 in omega Centauri
- Publication Year :
- 2017
-
Abstract
- We present a chemical abundance analysis of a metal-poor star, ROA 276, in the stellar system omega Centauri. We confirm that this star has an unusually high [Sr/Ba] abundance ratio. Additionally, ROA 276 exhibits remarkably high abundance ratios, [X/Fe], for all elements from Cu to Mo along with normal abundance ratios for the elements from Ba to Pb. The chemical abundance pattern of ROA 276, relative to a primordial omega Cen star ROA 46, is best fit by a fast-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 nucleosynthetic source can match the neutron-capture element distribution. ROA 276 arguably offers the most definitive proof to date that fast-rotating massive stars contributed to the production of heavy elements in the early Universe.<br />Comment: ApJ in press
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1702.07087
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/1538-4357/aa6250