Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..13..150s&link_type=abstract
Emission Lines from Jet Flows, Isla Mujeres, Q.R., México, November 13-17, 2000 (Eds. W. J. Henney, W. Steffen, A. C. Raga, and
Astronomy and Astrophysics
Astronomy
Hydrodynamics, Ism: Jets And Outflows, Planetary Nebulae: General, Stars: Post-Agb
Scientific paper
We present an alternative model for the formation of fast low-ionization emission regions (FLIERs) in planetary nebulae. The model is able to account for many of their attendant characteristics and circumvent the problems related to the collimation/formation mechanisms found in previous studies. In this model, a concave bow-shock structure is formed as a result of a reduced momentum flow along the symmetry axis of a stellar wind. FLIERS are formed from the shocked ambient medium. Since in the concave region of the bow-shock the ambient material can not flow away from the symmetry axis, it is compressed into a dense knot of jet-like feature (which we call ``stagnation knot'' or ``stagnation jet''). In the presence of a variable stellar wind these knots eventually overrun the expanding nebular shell and appear as detached FLIERS. We present two-dimensional hydrodynamic simulations of the formation and early evolution of stagnation knots and jets and compare their dynamical properties with those of FLIERs in planetary nebulae.
Lim Andrew J.
Lopez Jose Alberto
Steffen Will
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