Spectral models of stellar populations resolved in chemical abundances
Philippe Prugniel, Mina Koleva
TL;DR
This paper develops spectral models of stellar populations that account for variable chemical abundances, enabling more accurate analysis of stellar systems' chemical compositions.
Contribution
It introduces PEGASE.HR models resolved in [α/Fe] by combining observed and synthetic spectra, a novel semi-empirical approach for chemical abundance modeling.
Findings
Models successfully derive [α/Fe] in galaxies and star clusters
Models are publicly available for community use
Enhanced spectral analysis of stellar populations achieved
Abstract
We present model spectra of stellar populations with variable chemical composition. We derived the [alpha/Fe] abundance ratio of the stars of the most important libraries (ELODIE, CFLIB and MILES) using full spectrum fitting and we generated PEGASE.HR models resolved in [\alpha/Fe]. We used a semi-empirical approach that combines the observed spectra with synthetic stellar spectra. We tested the models using them to derive [\alpha/Fe] in galaxies and star clusters using full spectrum fitting. The present models are available from http://ulyss.univ-lyon1.fr
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