Observations of active-chromosphere stars - II. Photometry of AB Dor, 1978-1987

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Abstract
We present new photometric results on the rapidly rotating late-type active star AB Dor. The rapid changes in the shape and range of the light curve noted previously by other workers are also seen in our data. Combining our observations with previously published material gives 18 light curves spanning late 1978 to early 1987. Our qualitative analysis of these data suggests that over this time AB Dor had two large, long-lived starspots. One spot was present in late 1979, and decayed almost completely over about three years. The other was present in late 1978, decayed, and reappeared in late 1981. It then intensified to dominate the light curve in early 1984. The most recent light curve from 1987 January indicates a redevelopment of both spots. The rotational periods of the spots did not appear to change during these seven years, and to the accuracy of the observations, were identical at 0.51479±0.00001 day.

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