Derived Abundances of the Leo II Dwarf Galaxy

Astronomy and Astrophysics – Astronomy

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Scientific paper

We have derived titanium, calcium, and magnesium to iron abundances,
or alpha abundances [α/Fe], for red giant branch (RGB) stars in the dwarf galaxy Leo II from medium resolution spectra previously used by
Bolser et al. (2007) for Calcium triplet analysis. We used synthetic spectra to derive abundances of numerous weak alpha element lines and compare these abundances to four globular clusters taken as part of the same data set. This comparison reveals a weak evolutionary trend in [α/Fe] for Leo II. We also discuss the difficulties and limitations in this type analysis and how these difficulties can be overcome to produce reliable results. This project was completed in ten weeks during the McDonald Observatory REU and was supported under NSF AST-0649128.

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