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The neutral shells of Planetary Nebulae

Published online by Cambridge University Press:  25 May 2016

Antonella Natta  and
David Hollenbach
Antonella Natta
Affiliation:
1Osservatorio di Arcetri, Firenze
David Hollenbach
Affiliation:
2NASA Ames Research Center, Moffett Field, California

Extract

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Recent observations of a number of molecular lines, among them the H2 2μm vibrational transitions, have clearly shown that in many planetary nebulae (PNe) a significant component of the eject mass is neutral.

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 265
Copyright
Copyright © Kluwer 1997