Program: GS-2006A-Q-41

Title:Spectra of bulge stars with known abundance ratios for population synthesis applications
PI:Beatriz Barbuy
Co-I(s): Manuela Zoccali, Alan Alves-Brito, Laerte Sodre, Rodolfo Smiljanic, Paula Coelho

Abstract

We intend to obtain spectra of bulge stars, at low resolution (Delta lambda = 6 A), for population synthesis applications. Our sample stars were already observed with VLT-FLAMES, therefore we have spectra for all this sample, covering the wavelength range 6100-6800 A, for which we are in the process of deriving Iron abundances, as well as enhancements of alpha elements, and abundances of s- and r-elements. Therefore the abundance pattern of the sample stars will be known. The VLT-FLAMES spectra, taken in portions of 300 A, and total coverage of 700 A, are used to derive abundances, and do not have spectral coverage enough for populations synthesis work. We have coordinates for 200 stars in the field, with astrometric accuracy <0.3 arcsec. This library of bulge spectra will be implemented in the code by Bruzual & Charlot (2003), as well as our synthetic library that is already implemented in their code. It will be made available to any interested users. Our ultimate goal is to derive abundance ratios from integrated spectra of elliptical galaxies.