EVOLUTION OF WR RING NEBULAE GENERATED BY A MOVING CENTRAL STAR .2. THE INFLUENCE OF THE RED SUPERGIANT BOW SHOCK

We present detailed 2D simulations of the evolution of Wolf-Rayet ring nebulae expanding around stars which move through the interstellar me dium. Attention is paid to a description of how the circumstellar matt er is processed by the previous action of the stellar wind during the red supergiant phase. In particular, the radiative bow shock around th e red supergiant star suffers strong dynamical instabilities whose dev elopment influences the evolution of the ring nebula. The models are c ompared with some observed ring nebulae.