Morphology vs. physical properties: some comments and questions

Details Morphology vs. physical properties: some comments and questions Morphology vs. physical properties: some comments and questions

2000-01-13

arxiv.org/abs/astro-ph/0001232v1

Astronomy and Astrophysics

Astrophysics

9 pages, to appear in ``Asymmetrical Planetary Nebulae II: from Origins to Microstructures,'' ASP Conference Series, Vol. 199,

Scientific paper

Some of the correlations between morphological and other physical properties of planetary nebulae (PNe) are reviewed. In particular, the finding that bipolar (b) PNe have more massive progenitors than the other morphological classes is discussed in detail. Earlier results are confirmed; including all the various sources of uncertainty, the Galactic distribution of objects indicate that b PNe are formed by stars with initial masses >1.3 solar masses, while elliptical (e) PNe by progenitors with masses <1.3 solar masses. Recent results for the chemical abundances of b and e PNe and their orientation within the Galaxy are also presented. Finally, the key role in the discussion of the formation of b PNe played by detached binary systems such as symbiotic stars is briefly discussed.

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