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The Dust Content of Planetary Nebulae with Neutral Halos

Published online by Cambridge University Press:  19 July 2016

M. G. Hoare
M. G. Hoare*
Affiliation:
University College London

Abstract

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Young planetary nebulae (PN) which are still optically thick in the Lyman continuum can have a large fraction of material in neutral halos surrounding the ionized zone. The cool dust in the neutral region can make a significant contribution to the far infrared flux, reducing the derived dust-to-gas ratio. This is important when attempting to understand the apparent decrease in dust-to-gas ratio with nebular radius (age) suggested by Pottasch et al. (1984).

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 202
Copyright
Copyright © Kluwer 1989