Ionized Photoevaporation Flows in H II regions and PNe

Astronomy and Astrophysics – Astrophysics

Scientific paper

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H Ii Regions, Planetary Nebulae

Scientific paper

From proplyds to champagne flows, spanning 4 orders of magnitude in size and density, photoevaporation flows are ubiquitous in ion{H}{2} regions. Such flows are also found in planetary nebulae, in the form of cometary knots, although in this case the flows are often ``advection-dominated'', unlike the ``recombination-dominated'' flows that predominate in ion{H}{2} regions. The general properties of such flows are discussed, with particular reference to recent results on the Orion proplyds and the Helix knots.

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