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What CoRoT tells us about δ Scuti stars and their pulsational pattern
Eric Michel (Observatoire de Paris-LESIA)
Inspired by the so appealing example of the red giants, where going from a handful of stars to thousands revealed the structure of the eigenspectrum, we inspected a large homogeneous set of 1900 δ Scuti stars observed with CoRoT. This unique data set reveals a common regular pattern which looks in agreement with island modes featured by theoretical non-perturbative treatment of fast rotation. This pattern can be characterized at first order by a few parameters which might play the role of seismic indices for δ Scuti stars, as Δν and νmax did for red giants. This pattern offers an observational support for guiding further theoretical works on fast rotation. It provides a framework for further investigation of the observational material collected by CoRoT and Kepler. It sketches out the perspective of using δ Scuti stars pulsations for ensemble asteroseismology.