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Abstract :
[en] γ Doradus stars, exhibiting pure gravity modes pulsations, occupy the region between the solar-like oscillators and the delta Sct stars in the HRD. The
Kepler mission delivered data of unprecedented quality spanning up to 4 years, allowing to resolve closely spaced modes to measure, e.g., period spacings
and to infer internal rotation profiles. Here we present an ensemble study of all γ Doradus stars observed with the Kepler mission. We investigate among
others the range of excited modes, their amplitudes and the impact of rotation on these quantities. Our aim is to better understand the pulsation
excitation as well as the mode selection mechanism in these stars. Our results may help to also explain the lack of solar-like oscillators exhibiting g-modes
pulsations on the main sequence, although the instability domains of γ Doradus and solar-like stars overlap.
