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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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