The envelope of the power spectra of over a thousand δ Scuti stars: The T̅eff − νmax scaling relation★

CoRoT and Kepler high-precision photometric data allowed the detection and characterization of the oscillation parameters in stars other than the Sun. Moreover, thanks to the scaling relations, it is possible to estimate masses and radii for thousands of solar-type oscillating stars. Recently, a Delta nu-rho relation has been found for delta Scuti stars. Now, analysing several hundreds of this kind of stars observed with CoRoT and Kepler, we present an empiric relation between their frequency at maximum power of their oscillation spectra and their effective temperature. Such a relation can be explained with the help of the kappa-mechanism and the observed dispersion of the residuals is compatible with they being caused by the gravity-darkening effect.