A New Extensive Library of Synthetic Stellar Spectra from PHOENIX Atmospheres and its Application to Fitting VLT MUSE Spectra

Abstract

We present a new library of synthetic spectra based on the stellar atmosphere code PHOENIX. It covers the wavelength range from 500Å to 55000Å with a resolution of R=500000 in the optical and near IR, R=100000 in the IR and Δλ=0.1Å in the UV. The parameter space covers 2300K<=Teff<=8000K, 0.0<=log(g)<=6.0, -4.0<=[Fe/H]<=+1.0 and -0.3<=[α/Fe]<=+0.8. The library is work-in-progress and going to be extended to at least Teff=25000K. We use a new self-consistent way of describing the microturbulence for our model atmospheres. The entire library of synthetic spectra will be available for download. Futhermore we present a method for fitting spectra, especially designed to work with the new 2nd generation VLT instrument MUSE. We show that we can determine stellar parameters (Teff, log(g), [Fe/H] and [α/Fe]) and even single element abundances.