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Close binary central stars and the abundance discrepancy - new extreme objects

Published online by Cambridge University Press:  08 August 2017

R. Wesson
Affiliation:
Department of Physics and Astronomy, University College London, Gower St, London WC1E 6BT, UK European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago, Chile
D. Jones
Affiliation:
Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
J. García-Rojas
Affiliation:
Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
R. L. M. Corradi
Affiliation:
Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain Gran Telescopio CANARIAS S. A., c/ Cuesta de San José s/n, Breña Baja, E-38712 Santa Cruz de Tenerife, Spain
H. M. J. Boffin
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85738 Garching bei München, Germany
Corresponding
E-mail address:
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Abstract

Recent work (Corradi et al. 2015; Jones et al. 2016) has shown that the phenomenon of extreme abundance discrepancies, where recombination line abundances exceed collisionally excited line abundances by factors of 10 or more, seem to be strongly associated with planetary nebulae with close binary central stars. To further investigate, we have obtained spectra of a sample of nebulae with known close binary central stars, using FORS2 on the VLT, and we have discovered several new extreme abundance discrepancy objects. We did not find any non-extreme discrepancies, suggesting that a very high fraction of nebulae with close binary central stars also have an extreme abundance discrepancy.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

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