  In this paper we analyze a binary system consisting of a star and a rotating
black hole. The electromagnetic radiation emitted by the star interacts with
the background of the black hole and stimulates the production of dilaton
waves. We then estimate the energy transferred from the electromagnetic
radiation of the star to the dilaton field as a function of the frequency. The
resulting picture is a testable signature of the existence of dilaton fields as
predicted by string theory in an astrophysical context.
