The envelope of the power spectra of over a thousand \delta Scuti stars. The $\bar{T}_{eff}$-$\nu_{max}$ scaling relation

TL;DR

This study analyzes over a thousand elta Scuti stars using high-precision photometric data to establish a new empirical fficiency-temperature relation for their oscillation spectra, explaining it through stellar physics mechanisms.

Contribution

It presents the first empirical ar{T}_{eff}_{ u_{max}} relation for elta Scuti stars based on extensive observational data, linking oscillation properties to stellar temperature.

Findings

Established a ar{T}_{eff}_{ u_{max}} relation for elta Scuti stars.

The dispersion in residuals is consistent with gravity-darkening effects.

The relation is explained via the -kappa mechanism.

Abstract

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, analyzing 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.