VLBI OBSERVATIONS OF THE GRAVITATIONAL LENS-SYSTEM-0957+561

We present hybrid maps of the A and B images of 0957 + 561 from each o f four sessions of 6 cm VLBI observations that span the six-year inter val 1987-1993. The inner and outer jets are clearly detected and confi rm. the structures reported previously. There is no evidence of change in the separation between the core and inner-jet components, so the p rospect of measuring the time delay using differential proper motions is not promising. The flux density in the core of each image peaked be tween 1989 and 1992. From the variation in these flux densities, we ob tain a time-delay estimate of similar to 1 yr. (C) 1995 American Astro nomical Society.