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Mean Electron Densities, Distances and Filling Factors for Galactic Planetary Nebulae

Published online by Cambridge University Press:  07 August 2017

Robin L. Kingsburgh  and
M.J. Barlow
Robin L. Kingsburgh
Affiliation:
Dept. of Physics & Astronomy, U.C.L., Gower Street, London WC1E 6BT, U.K.
M.J. Barlow
Affiliation:
Dept. of Physics & Astronomy, U.C.L., Gower Street, London WC1E 6BT, U.K.

Abstract

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Mean electron densities are presented for over 100 planetary nebulae (PN). Distances to the majority of these PN are then derived, based on calibrations from observations of Magellanic Cloud PN. Absolute radii and filling factors have also been determined. A trend is seen in that for larger radii, smaller filling factors are found, however we show that such a trend results from uncertainties in the observed angular diameters.

Type
III. Highlights on the Nebulae
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 185
Copyright
Copyright © Kluwer 1993