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Observed Angular Motions in Planetary Nebulae

Published online by Cambridge University Press:  14 August 2015

Martha H. Liller  and
William Liller
Martha H. Liller
Affiliation:
Harvard College Observatory, Cambridge, Mass., U.S.A.
William Liller
Affiliation:
Harvard College Observatory, Cambridge, Mass., U.S.A.

Abstract

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Plates of planetary nebulae taken in October 1965 and June 1967 with the 100-inch and 60-inch telescopes on Mount Wilson are compared with photographs taken with the same instruments 40 or more years previously, to determine the amount of angular motion of material outward from the central stars. Densitometer tracings of the nebulae yield values of , the radial motion in seconds of arc per century for condensations (filaments, rings, etc.) as well as for the edges of the visible material. Preliminary data are presented for NGC 2392, 6818 and 7662. For NGC 2392 and NGC 7662 distances are derived.

Type
Session I – Basic Data
Information
Symposium - International Astronomical Union , Volume 34: Planetary Nebulae , 1968 , pp. 38 - 43
Copyright
Copyright © Reidel 1968 

References

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