2017ApJ...837..176Y

Query : 2017ApJ...837..176Y

2017ApJ...837..176Y - Astrophys. J., 837, 176-176 (2017/March-2)

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

YONG D., NORRIS J.E., DA COSTA G.S., STANFORD L.M., KARAKAS A.I., SHINGLES L.J., HIRSCHI R. and PIGNATARI M.

Abstract (from CDS):

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 M☉, [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.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): globular clusters: individual: ω Centauri - stars: abundances - stars: Population II - stars: Population II

VizieR on-line data: <Available at CDS (J/ApJ/837/176): table1.dat table2.dat>

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GB07 Scl76 RG* 00 59 12.0972695640 -33 46 20.953491492     17.266 16.36 15.98 ~ 21 0
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
3 HD 88609 Pe* 10 14 28.9853799600 +53 33 39.342740796 9.930 9.540 8.620 7.78 7.15 G5IIIw 217 0
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
5 2MASS J13265076-4733038 RG* 13 26 50.7729103008 -47 33 03.857447520   13.83 12.31   11.037 ~ 21 0
6 2MASS J13265674-4720527 RG* 13 26 56.7434661744 -47 20 52.749110904 14.90 13.08 11.61   9.923 ~ 33 0
7 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 920 0
8 NGC 6522 GlC 18 03 34.08 -30 02 02.3           ~ 569 0

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