ANOMALOUS PROPER MOTIONS IN THE CYGNUS SUPERBUBBLE REGION

In an analysis of proper motions of 0 and B stars contained in the Inp ut Catalogue for Hipparcos, we have found a clear deviation from the e xpected pattern of systematic motions which can be readily identified with the associations Cygnus OB1 and Cygnus OB9, located near the edge of the Cygnus Superbubble. The anomalous motions are directed outward s from the center of the Superbubble, which is coincident with the ass ociation Cygnus OB2. This seems to support the hypothesis of a strong stellar and supernova activity in Cygnus OB2 giving rise to the Superb ubble and, by means of gravitational instabilities in its boundaries, to Cygnus OB1 and Cygnus OB9. New uvbybeta aperture photometry of sele cted 0 and B stars in the area of Cygnus OB1 and Cygnus OB9 is also pr esented and analyzed in this paper.