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Dwarf Spheroidal Galaxies : from observations to models and vice versa

Yves Revaz (Ecole Polytechnique Fédérale de Lausanne)

In this talk, I will address how the state of the art chemo-dynamical simulations, combined with the results of recent ESO/Large programs dedicated to chemical abundances of hundreds of individuals stars,
such as DART, have improved our understanding of the formation and evolution of dwarf spheroidal galaxies (dSphs).

Thanks to a large sample of simulations performed with our Tree/SPH code
called GEAR that treats the complex physics of baryons, such as radiative cooling and feedback, star formation, and metal enrichment, I will discuss how the large variety in the dSph properties can now be understood in a single framework.

These well constrained models can now bring crucial clues on a number of critical parameters such as the supernova feedback, or the shape of the IMF etc., resulting in a deep impact on the final dSph abundance patterns.