Two-wind interaction models of the proplyds in the Orion nebula

Details Two-wind interaction models of the proplyds in the Orion nebula Two-wind interaction models of the proplyds in the Orion nebula

1997-04-25

arxiv.org/abs/astro-ph/9704256v1

Astronomy and Astrophysics

Astrophysics

10 pages, 3 included figures, LaTeX, uses crckapb.sty. To appear in: IAU Symposium 182 - Herbig-Haro flows and the birth of lo

Scientific paper

Many low-mass stars in the Orion nebula are associated with very compact (~= 1 arcsec) emission knots, known variously as proplyds, PIGs or LV knots. Some of these knots are teardrop-shaped, with ``tails'' pointing away from the massive star Theta 1 Ori C, which is the principal exciting star of the nebula. We discuss models of such knots, which invoke the interaction of the fast stellar wind from Theta 1 Ori C with a transonic photoevaporated flow from the surface of an accretion disk around a young low-mass star. We review previous analytic work and compare the results of the model with the observed brightnesses, morphologies and emission line profiles of the knots, as well as presenting new results from numerical hydrodynamical simulations.

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