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Since CoRoT observations unveiled the very low amplitude modes that form aflat plateau in the power spectrum structure of delta Scuti stars, the natureof this phenomenon, including the possibility of spurious signals due to thelight curve analysis, has been a matter of long-standing scientific debate. Wecontribute to this debate by finding the structural parameters of a sample offour delta Scuti stars, CID 546, CID 3619, CID 8669, and KIC 5892969, andlooking for a possible relation between these stars' structural parameters andtheir power spectrum structure. For the purposes of characterization, wedeveloped a method of studying and analysing the power spectrum with highprecision and have applied it to both CoRoT and Kepler light curves. We obtainthe best estimates to date of these stars' structural parameters. Moreover, weobserve that the power spectrum structure depends on the inclination,oblateness, and convective efficiency of each star. Our results suggest thatthe power spectrum structure is real and is possibly formed by 2-period islandmodes and chaotic modes.

Evidence of chaotic modes in the analysis of four delta Scuti stars