Poster abstract details

We carry out a modelling study of the effect of ionization and illumination on the morphologies of Planetary Nebulae (PNs), aiming to investigate the hypothesis of Kwok (2010, PASA, 27, 174) that the bipolar and multipolar lobes of PNs can be produced by leakage of UV photons into those directions. Using the photoionization code CLOUDY, we construct a nebular model consisting of a dense envelope and cones of low density. The results show that the visible morphologies of PNs might fundamentally differ from their intrinsic structure.