The Dynamical Evolution of Planetary Nebulae After the Fast Wind

Details The Dynamical Evolution of Planetary Nebulae After the Fast Wind The Dynamical Evolution of Planetary Nebulae After the Fast Wind

2006-06-08

arxiv.org/abs/astro-ph/0606205v1

Astrophys.J.646:L61-L64,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures, accepted by ApJ Letters

Scientific paper

10.1086/506559

In this paper we explore the dynamics of ionization bounded planetary nebulae after the termination of the fast stellar wind. When the stellar wind becomes negligible, the hot, shocked bubble depressurizes and the thermal pressure of the photoionized region, at the inner edge of the swept-up shell, becomes dominant. At this stage the shell tends to fragment creating clumps with comet-like tails and long, photoionized trails in between, while the photoionized material expands back towards the central stars as a rarefaction wave. Once that the photoionized gas fills the inner cavity, it develops a kinematical pattern of increasing velocity from the center outwards with a typical range of velociti es starting from the systemic velocity to 50 Km/s at the edges. The Helix nebula is a clear example of a planetary nebula at this late evolutionary stage.

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