
%0 Journal Article
%A Pierce, Mark J. 
%A Köppen, Joachim 
%A Parker, Quentin A. 
%A Frew, David J. 
%T PFP 1: A Large Planetary Nebula Caught in the First Stages of ISM Interaction
%J Publications of the Astronomical Society of Australia
%D 2004/09/07
%V 21
%N 3
%P 334-343
%K planetary nebulae: general &#8212; planetary nebulae: individual (PFP 1) &#8212; ISM: abundances &#8212; techniques: photometric &#8212; techniques: spectroscopic
%R https://doi.org/10.1071/AS04039
%U https://www.publish.csiro.au/paper/AS04039 
%X This paper presents (H&#945; &#43; [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&#47;UKST H&#945; 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&#180; 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 H&#945; surface brightness&#8211;radius relation. PFP 1 has near-perfect circular symmetry, broken only at the north-western edge which is coupled with significantly increased (H&#945; &#43; [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. 
