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The Effective Temperature of the Central Star, and a Criterion for Complete Absorption of Hydrogen Ionizing Photons by the Nebula

Published online by Cambridge University Press:  22 September 2016

S.R. Pottasch ,
P.R. Wesselius ,
C.-C. Wu  and
R.J. Van Duinen
S.R. Pottasch
Affiliation:
University of Groningen, The Netherlands
P.R. Wesselius
Affiliation:
University of Groningen, The Netherlands
C.-C. Wu
Affiliation:
University of Groningen, The Netherlands
R.J. Van Duinen
Affiliation:
University of Groningen, The Netherlands

Extract

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With the new measurements of the central star between 1500 Å and 3300 Å, practically the entire continuous emission has been measured or can be deduced if the nebula is optically thick for hydrogen and helium ionizing radiation. The effective temperature can then be found directly, if the ratio of the radius to the distance of the star is known. This latter quantity can be determined with different assumptions: that the brightness temperature in the visual is equal to the effective temperature is a reasonable assumption, with the advantage that even if it is not quite correct, the resultant effective temperature is only affected in a small way.

Type
Session IV: The Central Stars of Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 76: Planetary Nebulae , 1978 , pp. 210 - 211
Copyright
Copyright © Reidel 1978