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Paper: Chemical Abundances of the Kinematically Selected Thick Disk and Halo Stars
Volume: 458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page: 157
Authors: Ishigaki, M.; Chiba, M.; Aoki, W.
Abstract: We have estimated the abundances of Fe, Mg, Si, Ca and Ti for more than 90 nearby metal-poor (–3.5<[Fe/H]<–0.5) stars, likely belonging to the Milky Way thick disk, inner and outer stellar halo. High-resolution (R∼50000) spectra for the sample stars have been obtained with Subaru/HDS and analyzed using an LTE abundance analysis code in combination with Kurucz model atmosphere. We show that the thick disk sample stars show constantly high [Mg/Fe] and [Si/Fe] ratios with a small scatter, while the inner/outer halo stars show larger scatter as well as a mild decreasing trend with increasing metallicity at [Fe/H]> –2.0. Implications of these results for possible progenitors of the thick disk, inner/outer halo are discussed.
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