Abstract
The period variation of a W-type contact binary AM Leo is studied. It was shown mostly by our own data that (i) the orbital period of the system oscillates with a period of about 33 yr and an amplitude of about 0.008 day, and (ii) the secondary minima occur always (in the last 35 yr) slightly (∼1 min) earlier than expected. The latter point is explained in terms of a large persistent dark region on the leading hemisphere close to the neck region of the cooler primary component. Existence of such dark region is in agreement with observed O'Connell effect as fainter secondary maxima of the system. The period oscillation is critically studied in terms of the (i) mass transfer, (ii) third body, (iii) magnetic activity, and (iv) internal motions
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