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
N1 - Publisher Copyright:
© 2017. The American Astronomical Society. All rights reserved.
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 - http://www.scopus.com/inward/record.url?scp=85015906852&partnerID=8YFLogxK
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 -