Observed power spectra as a function of period (top) and scaled period (bottom) of our sample stars. The stars are sorted according to their luminosity and displayed as an horizontal band with the level of power indicated by the grey scale. The spectrum of KIC 1431599 (from Fig. 7) is indicated by a red arrow. Open red squares correspond to the dominant periods in the BRITE data and open blue squares indicate our measurements of ν_max. The period range in which to expect oscillations is marked with dashed lines. Typical spectral types and luminosity classes are given on the right-hand side.