Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.321..306l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 321, Issue 2, pp. 306-314.
Astronomy and Astrophysics
Astronomy
6
Accretion, Accretion Discs, Methods: Numerical, Stars: Formation, Ism: Jets And Outflows, Accretion, Accretion Discs, Methods: Numerical, Stars: Formation, Ism: Jets And Outflows
Scientific paper
Using a new code for three-dimensional adaptive hydrodynamics, a numerical simulation has been performed of a variable-source, Herbig-Haro-type jet. The time-dependence of the jet ejection vector is such that its direction precesses on a cone and its ejection speed varies as a sine wave. This early calculation has revealed several morphological features which result from the source variability and merit further investigation. These are: a distorted bowshock resulting from a combination of the precession and variable ram pressure from the jet-stem, a highly time-dependent and possibly unstable stagnation region in the centre of the bowshock around which the jet-stem precesses, a `ribbon-like' morphology of the jet-stem (owing to the stem undergoing an outward radial shock) and a cooler rarified region inside the cone traced out by the jet (resulting from the general outward radial motion inside the cocoon).
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