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PFP 1: A Large Planetary Nebula Caught in the First Stages of ISM Interaction

Published online by Cambridge University Press:  05 March 2013

Mark J. Pierce ,
David J. Frew ,
Quentin A. Parker  and
Joachim Köppen
Mark J. Pierce*
Affiliation:
Department of Physics, University of Bristol, Bristol, BS8 1TL, UK Department of Physics, Macquarie University, Sydney NSW 2109, Australia
David J. Frew
Affiliation:
Department of Physics, Macquarie University, Sydney NSW 2109, Australia
Quentin A. Parker
Affiliation:
Department of Physics, Macquarie University, Sydney NSW 2109, Australia Anglo-Australian Observatory, Epping NSW 1710, Australia
Joachim Köppen
Affiliation:
Observatoire de Strasbourg, 67000 Strasbourg, France International Space University, 67400 Illkirch-Graffenstaden, France Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel, Germany
*
FE-mail: mark.pierce@bristol.ac.uk
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Abstract

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This paper presents (Hα + [Nii]) imaging and spectroscopy of a previously unknown, highly evolved planetary nebula of low excitation which is in the first stages of an interaction with the interstellar medium (ISM). It was discovered serendipitously from AAO/UKST Hα Survey images as part of a project to exploit the survey data and has evaded detection by previous surveys due to its very low surface brightness. It is a remarkable hollow-sphere planetary nebula, some 19´ across, making it one of the largest examples of its type. We estimate a radius of 1.5 pc and a distance of 550 pc as derived from a new Hα surface brightness–radius relation. PFP 1 has near-perfect circular symmetry, broken only at the north-western edge which is coupled with significantly increased (Hα + [Nii]) intensity, both of which provide evidence for an interaction with the ISM. We find a near solar composition for this object with possibly enhanced He and N abundances. A blue central star candidate has been identified from the SuperCosmos Sky Survey data.

Keywords

planetary nebulae: generalplanetary nebulae: individual (PFP 1)ISM: abundancestechniques: photometrictechniques: spectroscopic
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 3 , 2004 , pp. 334 - 343
Copyright
Copyright © Astronomical Society of Australia 2004

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