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Thanks to high-precision photometric data legacy from space telescopes likeCoRoT and Kepler, the scientific community could detect and characterize thepower spectra of hundreds of thousands of stars. Using the scaling relations,it is possible to estimate masses and radii for solar-type pulsators. However,these stars are not the only kind of stellar objects that follow these rules:$\delta$ Scuti stars seem to be characterized with seismic indexes such as thelarge separation ($\Delta\nu$). Thanks to long-duration high-cadence TESS lightcurves, we analysed more than two thousand of this kind of classical pulsators.In that way, we propose the frequency at maximum power ($\nu_{\rm max}$) as aproper seismic index since it is directly related with the intrinsictemperature, mass and radius of the star. This parameter seems not to beaffected by rotation, inclination, extinction or resonances, with the exceptionof the evolution of the stellar parameters. Furthermore, we can constrainrotation and inclination using the departure of temperature produced by thegravity-darkening effect. This is especially feasible for fast rotators as mostof $\delta$ Scuti stars seem to be.

Unveiling the power spectra of $\delta$ Scuti stars with TESS. The temperature, gravity, and frequency scaling relation