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The Weak Emission Line Stars

Published online by Cambridge University Press:  26 May 2016

Jeffrey Fogel ,
Orsola De Marco  and
George Jacoby
Jeffrey Fogel
Affiliation:
Harvard University, Cambridge, MA, USA
Orsola De Marco
Affiliation:
American Museum of Natural History, New York, NY, USA
George Jacoby
Affiliation:
WYIN Observatory, Tucson, AZ, USA

Abstract

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In this paper, we study the evolution of the weak emission line central stars of planetary nebula (WELS), which are similar to the H-deficient Wolf-Rayet central stars except for systematically weaker emission lines. Our attempts at finding an evolutionary sequence for the WELS similar to what was established for Wolf-Rayet central stars, were unsuccessful. No correlation was found between any of the analysed quantities: emission and absorption line fluxes or stellar and nebular parameters from the literature. It does appear, however, that WELS have intermediate stellar temperatures (30–80 kK), and do not reside in the middle of Type I planetary nebulae, possibly indicating lower mass precursors.

Type
Part IV: Central Stars and their Atmospheres
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 235 - 236
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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