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Galactic Distribution, Radial Velocities and Masses of PN

Published online by Cambridge University Press:  19 July 2016

Walter J. Maciel*
Affiliation:
Instituto Astronômico e Geofísico da USP, Caixa Postal 30.627, 01051 São Paulo SP, Brasil

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Since the discovery in 1779 of the first planetary nebula in the Lyra constellation by Antoine Darquier, the total number of objects known as PN has been steadily increasing. About 1600 PN have been identified in the Galaxy, although 10–20% are probably misclassified objects, which include H II regions, reflection nebulae, symbiotic stars, etc. (see for example Kohoutek, 1987; Acker et al., 1987; Stenholm and Acker, 1987).

Type
II. Nebular Properties
Copyright
Copyright © Kluwer 1989 

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