Accretion-powered X-ray pulsars

This paper gives an overview of X-ray pulsars powered by the accretion of matter from a companion star in a close binary system. Recent advances in studies of X-ray pulsars are reviewed, with a special focus on the results of observations by the Hakucho and Tenma satellites. Some topics revealed by the Ginga satellite in the last one and a half years are also included to appeal for a new strategy for studying X-ray pulsars. (author)