({S}^5\): The destruction of a bright dwarf galaxy as revealed by the chemistry of the Indus stellar stream

({S}^5\): The destruction of a bright dwarf galaxy as revealed by the chemistry of the Indus stellar stream

The recently discovered Indus stellar stream exhibits a diverse chemical signature compared to what is found for most other streams due to the abundances of two outlier stars, Indus\(\_\)0 and Indus\(\_\)13. Indus\(\_\)13, exhibits an extreme enhancement in rapid neutron-capture (\(r\)-)process elem...

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Hauptverfasser: Hansen, T T, Ji, A P, Da Costa, G S, Li, T S, Casey, A R, Pace, A B, Cullinane, L R, Erkal, D, Koposov, S E, Kuehn, K, Lewis, G F, Mackey, D, Shipp, N, Zucker, D B, Bland-Hawthorn, J, the S5 Collaboration
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Abundance
Chemical analysis
Dwarf galaxies
Globular clusters
Nuclear capture
Outliers (statistics)
Stars
Stars & galaxies
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creator Hansen, T T
Ji, A P
Da Costa, G S
Li, T S
Casey, A R
Pace, A B
Cullinane, L R
Erkal, D
Koposov, S E
Kuehn, K
Lewis, G F
Mackey, D
Shipp, N
Zucker, D B
Bland-Hawthorn, J
the S5 Collaboration
description The recently discovered Indus stellar stream exhibits a diverse chemical signature compared to what is found for most other streams due to the abundances of two outlier stars, Indus\(\_\)0 and Indus\(\_\)13. Indus\(\_\)13, exhibits an extreme enhancement in rapid neutron-capture (\(r\)-)process elements with \(\mathrm{[Eu/Fe]} = +1.81\). It thus provides direct evidence of the accreted nature of \(r\)-process enhanced stars. In this paper we present a detailed chemical analysis of the neutron-capture elements in Indus\(\_\)13, revealing the star to be slightly actinide poor. The other outlier, Indus\(\_0\), displays a globular cluster-like signature with high N, Na, and Al abundances, while the rest of the Indus stars show abundances compatible with a dwarf galaxy origin. Hence, Indus\(\_0\) provides the first chemical evidence of a fully disrupted dwarf containing a globular cluster. We use the chemical signature of the Indus stars to discuss the nature of the stream progenitor which was likely a chemically evolved system, with a mass somewhere in the range from Ursa Minor to Fornax.
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subjects Abundance
Chemical analysis
Dwarf galaxies
Globular clusters
Nuclear capture
Outliers (statistics)
Stars
Stars & galaxies
title ({S}^5\): The destruction of a bright dwarf galaxy as revealed by the chemistry of the Indus stellar stream
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