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

Pignatari, Marco; Costa, Gary S. Da; Hirschi, Raphael; Karakas, Amanda I.; Norris, John E.; Shingles, Luke J.; Stanford, Laura M.; Yong, David

Authors

Gary S. Da Costa

Raphael Hirschi

Amanda I. Karakas

John E. Norris

Luke J. Shingles

Laura M. Stanford

David Yong

Abstract

© 2017. The American Astronomical Society. All rights reserved. We present a chemical abundance analysis of a metal-poor star, ROA 276, in the stellar system ω 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 ω Cen star ROA 46, is best fit by a fast-rotating low-metallicity massive stellar model of 20 , [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.

Journal Article Type Article
Publication Date Mar 10, 2017
Journal The astrophysical journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 837
Issue 2
Article Number ARTN 176
Pages 176
DOI https://doi.org/10.3847/1538-4357/aa6250
Keywords Space and Planetary Science; Astronomy and Astrophysics
Publisher URL http://iopscience.iop.org/article/10.3847/1538-4357/aa6250
Additional Information Journal title: The Astrophysical Journal; Article type: paper; Article title: A Chemical Signature from Fast-rotating Low-metallicity Massive Stars: ROA 276 inωCentauri; Copyright information: © 2017. The American Astronomical Society. All rights reserved.; Date received: 2016-12-08; Date accepted: 2017-02-17; Online publication date: 2017-03-16

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Copyright Statement
© 2017. The American Astronomical Society. All rights reserved.

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AM - Accepted Manuscript




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