Photoionization modeling of the Galactic planetary nebulae Abell 39 and NGC 7027

Abstract

We estimate distances to the spherical planetary nebula Abell 39 and the bipolar planetary nebula NGC 7027 by interpolating from a wide grid of photoionization models using the 3-D code, MOCASSIN. We find preliminary distances of 1.5 kpc and 0.9 kpc respectively, with uncertainties of about 30%.Comment: 2 pages, 1 figure, presented at the IAU Symposium 283 "Planetary Nebulae: an Eye to the Future", Puerto de la Cruz, Tenerife, Spain, 201