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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 661027.0, MPI für Astronomie / Publikationen_mpia
Chemical fingerprinting of stellar populations in the Milky Way halo
Authors:Chou, M. -. Y.; Majewski, S. R.; Cunha, K.; Smith, V. V.; Patterson, R. J.; Martínez-Delgado, D.; Ishigaki, M.; Suda, T.; Tsujimoto, T.; Arimoto, N.
Date of Publication (YYYY-MM-DD):2012
Title of Proceedings:Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way.
Start Page:209
End Page:210
Volume (in Series):458
Name of Conference/Meeting:Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Audience:Not Specified
Abstract / Description:The idea of "chemically fingerprinting" stars to their birth systems has been discussed over the last decade. Here we present an investigation of the chemical abundance patterns of halo substructures using high-resolution spectra. In particular, we study the abundances of the α-like element titanium (Ti) and the s-process elements yttrium (Y) and lanthanum (La) for M giant candidates of the Galactic Anticenter Stellar Structure (GASS, also known as the Monoceros Ring) and the Triangulum-Andromeda (TriAnd) Star Cloud. We apply "chemical fingerprinting" to the GASS/Monoceros Ring and TriAnd Star Cloud, to explore the origins of the two systems and the hypothesized connections between them. GASS has been debated either to originate from a part (e.g., warp) of the Galactic disk or tidal debris of a disrupted Milky Way (MW) satellite galaxy. Our exploration shows that GASS is indeed made of stars from a dwarf spheroidal (dSph) galaxy, although we still can not rule out the possibility that GASS was dynamically created out of a previously formed outer MW disk. And whereas the TriAnd Star Cloud has been assumed to come from the tidal disruption of the same accreted
Comment of the Author/Creator:Date: 2012, August 1, 2012
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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