HIGH-RESOLUTION IMAGING OF 2 BIPOLAR PROTOPLANETARY NEBULAE

Sub-arcsecond resolution V and I images have been obtained for two pro to-planetary nebulae. Both are found to show a definite bipolar morpho logy. A circumstellar disk is clearly seen in the V-I color image, sug gesting that the bipolar lobes are due to starlight scattered into the polar openings. This indicates that bipolar morphologies develop earl y in the evolution of planetary nebulae, even before the onset of phot oionization.