Photoionization modeling of the Galactic planetary nebulae Abell 39 and NGC 7027 [PDF]
Ashkbiz Danehkar, David J. Frew, Quentin A. Parker, Orsola De MarcoWe 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%.View original: http://arxiv.org/abs/1112.3184
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