| |
 |
| Paper: |
Chemical Abundances of Upper Red Giant Branch Halo Stars |
| Volume: |
458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way |
| Page: |
141 |
| Authors: |
Vargas, L. C.; Aoki, W. |
| Abstract: |
We present preliminary results from a spectroscopic program that targeted RGB halo stars of
comparable luminosities to those of stars in dwarf spheroidal galaxies (dSphs) accessible to high-resolution
spectroscopy. We have measured abundances for α, iron-peak, and other light elements
in 39 stars. In this contribution, we compare some of the halo and classical dSph abundance patterns
We report slight enhancements in α-elements in the halo relative to the classical dSphs, between
-2.5 ≤ [Fe/H] ≤ -1.5. [Na/Fe] in the dSphs is likewise under-abundant
by at least ∼ 0.2 dex in the same metallicity range. We also detect a tentative a Teff dependence in the Mg and Si abundance ratios of our RGB sample. |
|
|
|
|
|
