10-MU-M IMAGING OF THE BIPOLAR PROTOPLANETARY NEBULA MZ-3

A 10-mu m image is presented of the bipolar protoplanetary nebula Mz-3 made at the 3.9-m Anglo-Australian Telescope using the NIMPOL mid-inf rared imaging polarimeter. The image shows extended emission from warm (110-130 K) dust both to the north and to the south of the central st ar, which correlates well with the visible bipolar lobes. The observed surface brightness of this emission is consistent with radiative heat ing of the dust by both direct stellar illumination and trapped Lyman alpha photons. Emission in excess of the point-source profile indicate s that there is also an extended shell of dust surrounding the central star.