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Planetary Nebulae: Observational Properties, Mimics and Diagnostics

Published online by Cambridge University Press:  02 January 2013

David J. Frew  and
Quentin A. Parker
David J. Frew*
Affiliation:
Department of Physics, Macquarie University, North Ryde, NSW 2109 Perth Observatory, Bickley, WA 6076
Quentin A. Parker
Affiliation:
Department of Physics, Macquarie University, North Ryde, NSW 2109 Anglo–Australian Observatory, Epping, NSW 1710
*
DCorresponding author. Email: [email protected]
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Abstract

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The total number of true, likely and possible planetary nebulae (PN) now known in the Milky Way is nearly 3000, double the number known a decade ago. The new discoveries are a legacy of the recent availability of wide field, narrowband imaging surveys, primarily in the light of H-alpha. In this paper, we summarise the various PN discovery techniques, and give an overview of the many types of objects which mimic PN and which appear as contaminants in both Galactic and extragalactic samples. Much improved discrimination of classical PN from their mimics is now possible based on the wide variety of high-quality multiwavelength data sets that are now available. We offer improved taxonomic and observational definitions for the PN phenomenon based on evaluation of these better diagnostic capabilities. However, we note that evidence is increasing that the PN phenomenon is heterogeneous, and PN are likely to be formed from multiple evolutionary scenarios. In particular, the relationships between some collimated symbiotic outflows and bipolar PN remain uncertain.

Keywords

catalogsplanetary nebulae: generalstars: AGB and post-AGBstars: fundamental parameterssurveystechniques: photometricspectroscopic
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 27 , Issue 2 , 2010 , pp. 129 - 148
Copyright
Copyright © Astronomical Society of Australia 2010

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