Spectroscopic obs. of 2 red giant stars in omega Cen

DOI

We present a chemical abundance analysis of a metal-poor star, ROA276, 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 20M_{sun}_, [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.

Cone search capability for table J/ApJ/837/176/table1 (Stellar parameters for the program stars)

Identifier
DOI http://doi.org/10.26093/cds/vizier.18370176
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/837/176
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/837/176
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/837/176
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/837/176
Provenance
Creator Yong D.; Norris J.E.; Da Costa G.S.; Stanford L.M.; Karakas A.I.,Shingles L.J.; Hirschi R.; Pignatari M.
Publisher CDS
Publication Year 2017
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Interdisciplinary Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy