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A Direct Image of Wind Interaction in the Post-AGB Evolution : CO Observations of M1-92

V. Bujarrabal, J. Alcolea, R. Neri, M. Grewing
Centro Astronómico de Yebes (IGN), Apartado 148, E-19080 Guadalajara, Spain
IRAM, 300 rue de la Piscine, F-38406 St Martin d'Hères, France
Abstract: We present high-resolution CO J=1--0 maps of the protoplanetary nebula M1-92, Minkowski's Footprint, obtained with the IRAM interferometer at Plateau de Bure. The cartography is particularly revealing (see Fig. 2). Three components are distinguished in the maps: a bipolar outflow, with a (deprojected) velocity of about 65 kms , a hollow prolate structure, with an axial velocity increasing with the distance to the star up to about 60 kms , and a central condensation with velocities smaller than 10 kms . A remarkable continuity in position and velocity is found between the hollow component and the bipolar flow. We argue that these properties indicate that an important dynamical interaction between both features is active at the present moment and affects 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.



Figure: Channel maps of the CO J=1--0 line from M1--92 taken with the PdB mm-interferometer. Spatial units are offsets in arc seconds with respect to the position of the central star (cross). North is top and East is left. LSR velocities are marked in the upper left corner.

Robert Lucas
Thu Mar 9 12:58:13 MET 1995