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Multiple shell Planetary Nebulae: Evolutionary paths and observed configurations

Published online by Cambridge University Press:  25 May 2016

Letizia Stanghellini
Letizia Stanghellini*
Affiliation:
Osservatorio Astronomico di Bologna via Zamboni, 33 I-40126 Bologna, Italy

Abstract

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Recent observations of multiple shell planetary nebulae confirm the existing subdivision into two morphological types: attached halo and detached halo. The multiple shell phenomenon appears in about twenty-five percent of round and elliptical planetary nebulae of the Instituto de Astrofisica de Canarias morphological survey. The analysis of these nebulae together with that of their central stars lead to the interpretation that detached halo nebulae are formed through discontinuous mass loss at the Asymptotic Giant Branch tip. The attached halo nebulae, instead, are probably produced via dynamical nebular shaping.

Type
V. From AGB to Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 319 - 324
Copyright
Copyright © Kluwer 1997 

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