Six frequencies in four delta Scuti stars are actually alias images of super-Nyquist signals, identified by re-analyzing Kepler long-cadence data with the sliding Lomb-Scargle periodogram.
SuperWASP observations of pulsating Am stars
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abstract
We have studied over 1600 Am stars at a photometric precision of 1 mmag with SuperWASP photometric data. Contrary to previous belief, we find that around 200 Am stars are pulsating delta Sct and gamma Dor stars, with low amplitudes that have been missed in previous, less extensive studies. While the amplitudes are generally low, the presence of pulsation in Am stars places a strong constraint on atmospheric convection, and may require the pulsation to be laminar. While some pulsating Am stars have been previously found to be delta Sct stars, the vast majority of Am stars known to pulsate are presented in this paper. They will form the basis of future statistical studies of pulsation in the presence of atomic diffusion.
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Re-examining Super-Nyquist Frequencies of 68 $\delta$ Scuti Stars Utilizing the Kepler Long Cadence Photometry
Six frequencies in four delta Scuti stars are actually alias images of super-Nyquist signals, identified by re-analyzing Kepler long-cadence data with the sliding Lomb-Scargle periodogram.