Gaia-derived luminosities of Kepler A/F stars

We classify a sample of over 15000 Kepler A and F stars into {delta} Sct and non-{delta} Sct stars, paying close attention to variability that could have other origins. We find that 18 per cent of the {delta} Sct stars have their dominant frequency above the Kepler long-cadence Nyquist frequency (periods<1h), and 30 per cent have some super-Nyquist variability.

We analyse the pulsator fraction as a function of effective temperature and luminosity, finding that many stars in the {delta} Sct instability strip do not pulsate. The pulsator fraction peaks at just over 70 per cent in the middle of the instability strip. The results are insensitive to the amplitude threshold used to identify the pulsators.