Optical and Infrared Observations of the Bipolar Proto-Planetary Nebula Henize 401
Based on optical and near-infrared ground-based spectroscopy and optical and near-infrared Hubble Space Telescope (HST) images, we confirm the classification of Hen 401 as a bipolar proto-planetary nebula. HST images reveal a highly elongated morphology, consisting of two main bipolar lobes of unequal surface brightness separated by a dark lane of
García-Lario, Pedro et al.
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1999