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The Effect of CNO Metal Abundances on the Soft X-Ray Emission from He Rich White Dwarfs

Published online by Cambridge University Press:  12 April 2016

M.A. Barstow
M.A. Barstow*
Affiliation:
X-ray Astronomy Group, Physics Department, University of Leicester University Road, Leicester, LE1 7RH, UK

Abstract

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Predicted soft X-ray fluxes for model atmospheres containing varying concentrations of CNO metals are compared with those observed by EXOSAT for the planetary nebula nucleus K1-16. An effective temperature in the range ≈ 125000 − 180000K is determined for K1-16 and a limit on the concentration of CNO in the atmosphere (between 0.02 and 20 ×solar relative to He) obtained. Some comments on the application of the models to the apparently metal rich star H1504+65 are included.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 114: White Dwarfs , 1989 , pp. 202 - 205
Copyright
Copyright © Springer-Verlag 1989

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