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Weak emission line central stars of planetary nebulae†

Published online by Cambridge University Press:  30 August 2012

Helga Todt ,
Miriam Peña ,
Julia Zühlke ,
Lida Oskinova ,
Wolf-Rainer Hamann  and
Götz Gräfener
Helga Todt
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany email: [email protected]
Miriam Peña
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70264, México D.F. 04510, México
Julia Zühlke
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany email: [email protected]
Lida Oskinova
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany email: [email protected]
Wolf-Rainer Hamann
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany email: [email protected]
Götz Gräfener
Affiliation:
Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany email: [email protected] Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
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Abstract

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To understand the evolution and morphology of planetary nebulae, a detailed knowledge of their central stars is required. Central stars that exhibit emission lines in their spectra, indicating stellar mass-loss allow to study the evolution of planetary nebulae in action. Emission line central stars constitute about 10 % of all central stars. Half of them are practically hydrogen-free Wolf-Rayet type central stars of the carbon sequence, [WC], that show strong emission lines of carbon and oxygen in their spectra. In this contribution we address the weak emission-lines central stars (wels). These stars are poorly analyzed and their hydrogen content is mostly unknown. We obtained optical spectra, that include the important Balmer lines of hydrogen, for four weak emission line central stars. We present the results of our analysis, provide spectral classification and discuss possible explanations for their formation and evolution.

Keywords

stars: AGB and post-AGBstars: Wolf-Rayetstars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 510 - 511
Copyright
Copyright © International Astronomical Union 2012

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