The Morphological and Structural Classification of Planetary Nebulae
We present a statistical analysis of a complete sample (255) of northern planetary nebulae (PNe). Our analysis is based on morphology as a main parameter. The major morphological classes are: round (26% of the sample), elliptical (61%), and bipolar (13%) PNe. About a half of the round and 30 % of the elliptical PNe present multiple
Manchado, A. et al.
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