A homogeneous non-LTE analysis of 94 Milky Way stars shows thick-disk and halo stars have a nearly constant ~0.3 dex enhancement of Mg, Si, Ca, and Ti relative to iron at low metallicity.
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Abundances of alpha-Process Elements in Thin-Disk, Thick-Disk, and Halo Stars of the Galaxy: Non-LTE Analysis
A homogeneous non-LTE analysis of 94 Milky Way stars shows thick-disk and halo stars have a nearly constant ~0.3 dex enhancement of Mg, Si, Ca, and Ti relative to iron at low metallicity.