A DIRECT IMAGE OF WIND INTERACTION IN THE POST-AGB EVOLUTION - CO OBSERVATIONS OF M1-92

We present high-resolution CO J = 1-0 maps of the protoplanetary nebul a M1-92, Minkowski's Footprint, obtained with the IRAM interferometer at Plateau de Bure. The cartography is particularly revealing. Three c omponents are distinguished in the maps: a bipolar outflow, with a (de projected) velocity of similar to 65 km s(-1), a hollow prolate struct ure, with an axial velocity increasing with the distance to the star u p to similar to 60 km s(-1) and a central condensation with velocities smaller than 10 km s(-1). A remarkable continuity in position and vel ocity is found between the hollow component and the bipolar flow. We a rgue that these properties indicate that an important dynamical intera ction between both features is active at the present moment and affect s most of the nebular material. Such an interaction would consist in a significant momentum transport from the bipolar fast flow to the rest of the nebula.