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Quantitative spectral classification of late WC stars

Published online by Cambridge University Press:  25 May 2016

Orsola de Marco ,
P. A. Crowther  and
M. J. Barlow
Orsola de Marco
Affiliation:
Dept. of Physics & Astronomy, UCL, Gower St., London WC1E 6BT, UK
P. A. Crowther
Affiliation:
Dept. of Physics & Astronomy, UCL, Gower St., London WC1E 6BT, UK
M. J. Barlow
Affiliation:
Dept. of Physics & Astronomy, UCL, Gower St., London WC1E 6BT, UK

Extract

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We present a revised classification scheme for late WC-type stars based on new high quality optical observations of seven stars. For consistency with the usual WC scheme (Smith, ApJ 358 229 1990), our principal diagnostic is Cvi λ5801/Ciii λ5696, while Ciii λ5696/Cii λ4267, and He II λ4686/He I λ5876 serve as secondary criteria. Our quantitative scheme forms an natural extension to the existing WC scheme and provides an unambiguous definition of subtypes, with natural breaks found between subclasses.

Type
I. Introduction
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 19
Copyright
Copyright © Kluwer 1997