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The Space Distribution of Planetary Nebulae

Published online by Cambridge University Press:  14 August 2015

J.H. Cahn
J.H. Cahn*
Affiliation:
University College London, England

Abstract

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A punched-card catalogue of planetary nebulae has been prepared, using data extracted from all existing catalogues. A computer program calculates distances and radii using the method of Shklovsky, in which all nebulae are assumed to have the same ionized mass, and allowance for interstellar extinction is made assuming a continuous galactic-dust distribution. The assumption made in Shklovsky's method, that the nebulae are optically thin, is considered to be satisfied if the calculated radii lie within a certain well-defined interval. The reddening constants obtained are in satisfactory statistical agreement with constants determined by other methods. The local density of planetary nebulae is in agreement with estimates of local white-dwarf densities.

Type
Session I – Basic Data
Information
Symposium - International Astronomical Union , Volume 34: Planetary Nebulae , 1968 , pp. 44 - 50
Copyright
Copyright © Reidel 1968 

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