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A study of the star KIC5892969 observed by the Kepler satellite is presented.Its three highest amplitude modes present a strong amplitude modulation. Theaim of this work is to investigate amplitude variations in this star and theirpossible cause. Using the 4 years-long observations available, we obtained thefrequency content of the full light curve. Then, we studied the amplitude andphase variations with time using shorter time stamps. The results obtained arecompared with the predicted ones for resonant mode coupling of an unstable modewith lower frequency stable modes. Our conclusion is that resonant modecoupling is consistent as an amplitude limitation mechanism in several modes ofKIC5892969 and we discuss to which extent it might play an important role forother delta Scuti stars.

Evidence of amplitude modulation due to Resonant Mode Coupling in the delta Scuti star KIC5892969