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Expansion Velocities and Characteristics of Galactic Planetary Nebulae

Published online by Cambridge University Press:  19 July 2016

Ronald Weinberger
Ronald Weinberger*
Affiliation:
Universität Innsbruck, Institut für Astronomie, Technikerstrasse 25, A-6020 Austria

Abstract

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An up-to-date account of expansion data and their interpretation is provided.- the importance of spatiokine-matical models is underlined; bipolar outflows appear to be characteristic of very young objects and prolate spheroids (including toroids and rings) seem to be a useful approximation for many PN.- High-velocity features are much more frequent than previously assumed.- Expansion velocities vs. linear radii diagrams for [OIII], HI, and [NII], based on a new catalogue show a broad, rather homogeneous distribution and thus are of limited value for studies of the dynamical evolution or formation mechanisms of PN - future investigations of these relations should be pursued separately for groups of PN with similar physical properties; a difference in the kinematical properties of B and C nebulae could, however, be confirmed.- Several recommendations for work in this area are added.

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 93 - 104
Copyright
Copyright © Kluwer 1989 

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