An attempt at the first direct test of the theory of large-scale mass transfer between the components of a binary system is discussed. It is argued that .beta. Lyr is the only binatry in the sky for which such a test is presently possible.
An attempt at the first direct test of the theory of large-scale mass transfer between the components of a binary system is discussed. It is argued that .beta. Lyr is the only binatry in the sky for which such a test is presently possible. (en)