Abstract
Light variations of the many stars of different kinds shows multiple periodicities. These are shown in the light curves of both the intrinsic and the close binary stars. The spectra of one group of close binary systems have H and K emission lines. Some of their variations of light curves are described as distorted wave or migrating wave. This phenomenon is interpreted as starspots, or spot region, which are observed at different orbital phases. The South Pole is the unique location on earth for the continuous stellar observation. Not only the cycle‐to‐cycle light variation, but also the eruptive feture can be investigated. In the starspot model, the activity cycle of the stars can be studied in detail.
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