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The Neutral Envelopes of Planetary Nebulae: Molecules and H I

Published online by Cambridge University Press:  07 August 2017

P.J. Huggins
P.J. Huggins*
Affiliation:
Physics Department, New York University, 4 Washington Place, New York, NY 10003, U.S.A.

Abstract

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This paper summarizes recent developments in the study of planetary nebulae using observations of molecular lines and the 21 cm line of H I. The observations reveal that many planetary nebulae are surrounded by envelopes of neutral gas, whose mass often exceeds that of the ionized nebulae. They also provide valuable information on the physical and chemical properties of the envelopes, their structure, and kinematics. The neutral envelopes firmly link the formation of planetary nebulae with the mass loss by AGB stars, and can play an important role in the subsequent evolution of the nebulae.

Type
III. Highlights on the Nebulae
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 147 - 154
Copyright
Copyright © Kluwer 1993 

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