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Electron excitation of heavy elements in Planetary Nebulae

Published online by Cambridge University Press:  25 May 2016

T. Schöning  and
K. Butler
T. Schöning
Affiliation:
University Observatory Munich
K. Butler
Affiliation:
University Observatory Munich

Extract

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Modern observational equipment makes it possible to identify extremely weak metal lines in deep surveys of the optical and near-IR region of the electromagnetic spectrum. In particular, collisionally excited lines from heavy ions (Z > 30) have been recently identified in the spectrum of NGC 7027 (Péquignot & Baluteau 1994). However, detailed quantitative analyses of the observed lines have not been feasible due to the lack of accurate collisional data for the heavy elements.

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 279
Copyright
Copyright © Kluwer 1997 

References

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