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Figure 1: The differential photometry obtained at each observatory (DE - open circles, OSN - squares, APT - filled circles) normalized to zero. The solid line is a least squares fit of two frequencies, which were revealed from subsequently prewhitened amplitude Fourier spectra of the combined data. |
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Figure 2: Strömgren y-filter Fourier spectra: a) 15 And relative to HD 220575; b) 15 And relative to 10 Lac; c) HD 220575 relative to 10 Lac. |
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Figure 3: Fourier amplitude spectrum of the combined data in the V and y filters. Some prewhitening steps are indicated. |
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