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The Determination of Extinction and Temperature for the Central Star of the Planetary Nebula NGC 40

Published online by Cambridge University Press:  04 August 2017

L. Bianchi  and
M. Grewing
L. Bianchi
Affiliation:
Astronomical Observatory of Turin
M. Grewing
Affiliation:
Astronomical Institute, University of Tubingen

Abstract

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NGC 40 is an extended, very inhomogeneous planetary nebula, with a WC8 central star. Very discrepant determinations exist in the literature for the extinction towards this object and the temperature of its nucleus. We review here the various methods which can be used to derive these quantities, discussing the assumptions underlying each method and their inherent limitatons, and the uncertainties that arise when they are applied to this particular object. The results are compared to the values which we derive from far UV spectrophotometry: E(B-V) = 0.50 and T* ≍ 90000K.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 111: Calibration of Fundamental Stellar Quantities , 1985 , pp. 603 - 609
Copyright
Copyright © Reidel 1985 

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