Publications of the Astronomical Society of Australia Publications of the Astronomical Society of Australia Society
Publications of the Astronomical Society of Australia
RESEARCH ARTICLE

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

Mark J. Pierce, Joachim Köppen, Quentin A. Parker and David J. Frew

Publications of the Astronomical Society of Australia 21(3) 334 - 343
Published: 30 September 2004

Abstract

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: general — planetary nebulae: individual (PFP 1) — ISM: abundances — techniques: photometric — techniques: spectroscopic

https://doi.org/10.1071/AS04039

© ASA 2004

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