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Preprint 09a/99

Survey of Large Planetary Nebulae in Decay

Thomas Rauch (1), Elise Furlan (2), Florian Kerber (3), Miguel Roth (4)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2) Institut für Astrophysik, Univ. Innsbruck, Austria
(3) ST-ECF, Garching, Germany
(4) Carnegie Observatories, Pasadena, USA

To appear in: Asymmetrical Planetary Nebulae II: From Origins to Microstructures, ASP Conference Series, Vol. XXX, J.H. Kastner, N. Soker, & S. Rappaport, eds., 2000

Abstract. The Planetary Nebulae (PNe) return nuclear processed stellar material back to the interstellar medium (ISM) and thus have an important inuence on the chemical evolution of our Galaxy. We present results of a survey of PNe in decay which have reached a density comparable to the ambient ISM which leads to an interaction with it. This gives us the opportunity to investigate properties of the ISM. We have identified about 20 new examples for this interaction, demonstrating that it is a more common phenomenon than previously expected: Different stages of interaction, ranging from the early (asymmetric brightness distribution) to the very advanced (parabolic or distorted shape and/or an off-center central star) are obvious.

Key words: -

Paper (230k gzip'ed Postscript including figures)

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