Paper:	HST/NICMOS Observations of the Planetary Nebula NGC 7027
Volume:	199, Asymmetrical Planetary Nebulae II: From Origins to Microstructures
Page:	221
Authors:	Dayal, Aditya; Latter, William B.; Bieging, John H.; Meakin, Casey; Kelly, Douglas M.; Hora, Joseph L.; Tielens, A. G. G. M.
Abstract:	We report results from a Hubble Space Telescope (HST) and Near- Infrared Camera and Multiobject Spectrometer (NICMOS) program to study the distribution of hot neutral and ionized circumstellar material in the young planetary nebula NGC 7027. The central star is clearly revealed, providing near-infrared fluxes that are used to directly determine the stellar temperature very accurately (T* = 198,000 K). We construct 3-D spatial/kinematical models of various components of the nebula. It is found that the photodissociation layer as revealed by near-infrared molecular hydrogen emission is very thin (ΔR ~ 6×1016 cm), biconical in shape and lies outside the ionized gas.

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