The rebrightening of planetary nebulae through ISM interaction

Details The rebrightening of planetary nebulae through ISM interaction The rebrightening of planetary nebulae through ISM interaction

2009-10-12

arxiv.org/abs/0910.2200v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Review paper accepted to PASA. 8 pages, 5 figures. High resolution images available from the author

Scientific paper

The interaction of planetary nebulae (PNe) with the interstellar medium as they move through it is now acknowledged to be a major shaping effect not just for ancient and large PNe, but also for relatively young PNe with high speed central stars. The most common effect is a rebrightening as the PN shell interacts with a pre-existing bow shock structure formed during the previous evolutionary phase of the central star. In this review, we consider this rebrightening in detail for the first time and discuss its origins, highlighting some observed examples. We go on to discuss the AGB star progenitors, reviewing the evidence for bow shock structures, and consider the progeny of rebrightened PNe - strongly disrupted objects which bear very little resemblance to typical PNe. Sh 2-68 is inferred to be perhaps the only documented case so far of such a PN.

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