Globular clusters' lowest-aluminum populations separate into distinct in-situ and accreted regions of the [Al/Fe]-[Fe/H] plane, alongside mass-dependent abundances in five dwarf galaxies.
Abundances and Kinematics of Field Halo and Disk Stars I: Observational Data and Abundance Analysis
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abstract
We describe observations and abundance analysis of a high-resolution, high-S/N survey of 168 stars, most of which are metal-poor dwarfs. We follow a self-consistent LTE analysis technique to determine the stellar parameters and abundances, and estimate the effects of random and systematic uncertainties on the resulting abundances. Element-to-iron ratios are derived for key alpha, odd, Fe-peak, r- and s-process elements. Effects of Non-LTE on the analysis of Fe I lines are shown to be very small on the average. Spectroscopically determined surface gravities are derived that are generally close to those obtained from Hipparcos parallaxes.
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Chemical Abundances and Globular Clusters of Milky Way Dwarf Galaxies
Globular clusters' lowest-aluminum populations separate into distinct in-situ and accreted regions of the [Al/Fe]-[Fe/H] plane, alongside mass-dependent abundances in five dwarf galaxies.