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This paper examines the 46 frequencies found in the Delta Sct star KIC8054146 involving a frequency spacing of exactly 2.814 c/d (32.57 microHz),which is also a dominant low-frequency peak near or equal to the rotationalfrequency. These 46 frequencies range up to 146 c/d. Three years of Kepler datareveal distinct sequences of these equidistantly spaced frequencies, includingthe basic sequence and side lobes associated with other dominant modes (i.e.,small amplitude modulations). The amplitudes of the basic sequence show ahigh-low pattern. The basic sequence follows the equation fm = 2.8519 + m *2.81421 c/d with m ranging from 25 to 35. The zero-point offset and the lack oflow-order harmonics eliminate an interpretation in terms of a Fourier series ofa non-sinusoidal light curve. The exactness of the spacing eliminateshigh-order asymptotic pulsation. The frequency pattern is not compatible withsimple hypotheses involving single or multiple spots, even with differentialrotation. The basic high-frequency sequence is interpreted in terms of progradesectoral modes. These can be marginally unstable, while their correspondinglow-degree counterparts are stable due to stronger damping. The measuredprojected rotation velocity (300 km/s) indicates that the star rotates withapp. 70% of the Keplerian break-up velocity. This suggests a near equator-onview. We qualitatively examine the visibility of prograde sectoral high-degreeg-modes in integrated photometric light in such a geometrical configuration andfind that prograde sectoral modes can reproduce the frequencies and theodd-even amplitude pattern of the high-frequency sequence.

Detection of high-degree prograde sectoral mode sequences in the A-star KIC 8054146?