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simulated light curves and power spectra (periodograms)
obtained with ULTRACAM on the WHT and SALT
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source is an R=16 variable star observed during bright time in 1" seeing
using 0.005 s exposures
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source varies with amplitude 2.5% and period 0.04 s
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light-curves are of limited use when acquiring
data at the highest rates - power spectra prove to be the most useful tools
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the advantages of using large-aperture telescopes are clearly
apparent - the 25 Hz peak is absent in WHT data but prominent in SALT data
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