The Morphological and Structural Classification of Planetary Nebulae

Details The Morphological and Structural Classification of Planetary Nebulae The Morphological and Structural Classification of Planetary Nebulae

2000-02-03

arxiv.org/abs/astro-ph/0002073v1

Astronomy and Astrophysics

Astrophysics

7 pages, to appear in "Asymmetrical Planetary Nebulae II: from Origins to Microstructures", ASP Conference Series, J.H. Kastne

Scientific paper

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 shells. Round PNe have higher galactic latitude (| b| = 12) and galactic height ( = 753 pc), than the elliptical (|b| = 7, = 308 pc) and bipolar (|b| = 3, =179 pc). This possibly implies a different progenitor mass range across morphology, as a different stellar population would suggest.

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