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Gravito-acoustic modes in the Sun and other stars propagate in resonantcavities with a frequency below a given limit known as the cut-off frequency.At higher frequencies, waves are no longer trapped in the stellar interior andbecome traveller waves. In this article we study six pulsating solar-like starsat different evolutionary stages observed by the NASA Kepler mission. Thesehigh signal-to-noise targets show a peak structure that extends at very highfrequencies and are good candidates for studying the transition region betweenthe modes and the interference peaks or pseudo-modes. Following the samemethodology successfully applied on Sun-as-a-star measurements, we uncover theexistence of pseudo-modes in these stars with one or two dominant interferencepatterns depending on the evolutionary stage of the star. We also infer theircut-off frequency as the midpoint between the last eigenmode and the first peakof the interference patterns. By using ray theory we show that, while theperiod of one of the interference pattern is very close to half the largeseparation the other, one depends on the time phase of mixed waves, thuscarrying additional information on the stellar structure and evolution.

Analysis of the acoustic cut-off frequency and HIPs in six Kepler stars with stochastically excited pulsations