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Multiple Shell Planetary Nebulae

Published online by Cambridge University Press:  19 July 2016

You-Hua Chu
You-Hua Chu*
Affiliation:
Astronomy Department, University of Illinois, 1011 W. Springfield Avenue, Urbana, IL 61801, U. S. A.

Abstract

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It has been shown in several independent investigations that the multiple-shell phenomenon is prevalent in planetary nebulae. Despite the common classification, the multiple shell planetary nebulae are a heterogeneous group of objects, as testified by the wide variety of their morphologies and physical structures. There are two types of double-shell structures that are seen frequently: one has an inner shell expanding supersonically into a faint, subsonically expanding halo, and the other has a bright attached envelope co-expanding with the inner shell. The physical structures and relative elemental abundances in the shells are reviewed, and their possible formation mechanisms are discussed.

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 105 - 116
Copyright
Copyright © Kluwer 1989 

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