Binary Stars among Cataclysmic Variables. VII. on the Kinematics and Space Distribution of W Ursae Majoris and U Geminorum-Type Stars.
On the basis of the most recent determination of the mean absolute maguitudes of W UMa and U Gem stars, the z-distributions and solar motions of the two kinds of variables are compared and are found to be very similar. It is suggested that the U Gem stars are probably descendants of the W UMa systems.