A Chemical Signature from Fast-rotating Low-metallicity Massive Stars: ROA 276 in ω Centauri

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

doi:10.3847/1538-4357/aa6250

A Chemical Signature from Fast-rotating Low-metallicity Massive Stars: ROA 276 in ω Centauri

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

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Abstract

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.

Original language	English
Article number	176
Journal	Astrophysical Journal
Volume	837
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aa6250
Publication status	Published - 10 Mar 2017

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title = "A Chemical Signature from Fast-rotating Low-metallicity Massive Stars: ROA 276 in ω Centauri",

abstract = "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.",

keywords = "globular clusters: individual (ω Centauri), stars: Population II, stars: abundances",

author = "David Yong and Norris, \{John E.\} and Costa, \{Gary S.Da\} and Stanford, \{Laura M.\} and Karakas, \{Amanda I.\} and Shingles, \{Luke J.\} and Raphael Hirschi and Marco Pignatari",

year = "2017",

month = mar,

day = "10",

doi = "10.3847/1538-4357/aa6250",

language = "English",

volume = "837",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - A Chemical Signature from Fast-rotating Low-metallicity Massive Stars

T2 - ROA 276 in ω Centauri

AU - Yong, David

AU - Norris, John E.

AU - Costa, Gary S.Da

AU - Stanford, Laura M.

AU - Karakas, Amanda I.

AU - Shingles, Luke J.

AU - Hirschi, Raphael

AU - Pignatari, Marco

PY - 2017/3/10

Y1 - 2017/3/10

N2 - 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.

AB - 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.

KW - globular clusters: individual (ω Centauri)

KW - stars: Population II

KW - stars: abundances

UR - https://www.scopus.com/pages/publications/85015906852

U2 - 10.3847/1538-4357/aa6250

DO - 10.3847/1538-4357/aa6250

M3 - Article

SN - 0004-637X

VL - 837

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 176

ER -

A Chemical Signature from Fast-rotating Low-metallicity Massive Stars: ROA 276 in ω Centauri

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