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Plasma diagnostics for planetary nebulae and H ii regions using N ii and O ii optical recombination lines

Published online by Cambridge University Press:  30 August 2012

Ian A. McNabb ,
Xuan Fang ,
Xiao–Wei Liu  and
Peter J. Storey
Ian A. McNabb
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China email: [email protected]
Xuan Fang
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, China
Xiao–Wei Liu
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China email: [email protected] Department of Astronomy, Peking University, Beijing 100871, China
Peter J. Storey
Affiliation:
Department of Physics and Astronomy, University College London, London WC1E 6BT, UK
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Abstract

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We carry out plasma diagnostic analysis for a number of planetary nebulae (PNe) and H ii regions. We use N ii and O ii optical recombination lines (ORLs) with new effective recombination coefficients calculated under the intermediate coupling scheme, for a range of electron temperatures (Te) and densities (Ne), and fitted against the most reliable measurements. Comparing Te derived from ORLs, collisionally excited lines (CELs), the hydrogen Balmer Jump, and/or He i if available, we find the relation Te (ORLs) < Te (He i) < Te (H i BJ) < Te (CELs), confirming the physical conditions in the bi-abundance model postulated by Liu et al., i.e. the nebula contains another cold, metal-rich and probably H-deficient component.

Keywords

planetary nebulae: generalHII regionsatomic dataatomic processes
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 432 - 433
Copyright
Copyright © International Astronomical Union 2012