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Einstein X-ray Observations of Planetary Nebulae and their Implications

Published online by Cambridge University Press:  19 July 2016

S. P. Tarafdar  and
K.M. V. Apparao
S. P. Tarafdar
Affiliation:
Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005, India
K.M. V. Apparao
Affiliation:
Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005, India

Abstract

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Central stars of nineteen planetary nebulae were observed for X-ray emission using the Einstein Observatory and four of them were detected. High resolution observations with the Einstein Observatory indicates that the X-ray source in NGC 246 is a point source. These planetary nebulae with positive observations turn out to be the nearest, have the least extinction and also have the largest size of the nebulae around them. It is possible that X-ray emission is observed from these planetary nebulae with larger ages because of the smaller extinction by the nebulae and also due to the settling of heavy elements in the central star which otherwise prevents escape of X-rays by providing opacity.

Type
III. Central Stars
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 304
Copyright
Copyright © Kluwer 1989