Paper:	Near-Infrared Observations of Molecular Hydrogen Emission in Planetary Nebulae
Volume:	199, Asymmetrical Planetary Nebulae II: From Origins to Microstructures
Page:	333
Authors:	Likkel, Lauren; Kindt, Anna; Dinerstein, Harriet L.; Lester, Dan F.
Abstract:	We are investigating the excitation mechanism of the near-infrared emission from vibrationally-excited H2 in planetary nebulae by means of long-slit spectroscopy. We present K-band spectroscopic observations of J 900, IC 5117, and Vy 2-2 obtained at McDonald Observatory. In these objects, the intensity ratios of the H2 lines suggest that either shock excitation is the dominant excitation mechanism, or that high densities have modified the emergent spectrum of a UV-illuminated region.

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