Detailed Abundances in the Galactic Center: Evidence of a Metal-rich Alpha-enhanced Stellar Population

We thank Anish Amarsi for hosting B.T. in Heidelberg and assisting with the NLTE calculations. We also thank Mattia Sormani for his comments and suggestions. B.T. and N.R. acknowledge support from the Swedish Research Council, VR (project number 621-2014-5640), Funds from Kungl. Fysiografiska Sallskapet i Lund. (Stiftelsen Walter Gyllenbergs fond and Marta och Erik Holmbergs donation), and from the project grant "The New Milky" from the Knut and Alice Wallenberg foundation. M.S. acknowledges the Programme National de Cosmologie et Galaxies (PNCG) of CNRS/INSU, France, for financial support. R.M.R. acknowledges financial support from his late father Jay Baum Rich. F.R. acknowledges support from the Knut and Alice Wallenberg Foundation. A portion of this work was done at the Sexten Center for Astrophysics; the authors acknowledge their hospitality. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.