A 3-mode, Variable Velocity Jet Model for HH 34

Details A 3-mode, Variable Velocity Jet Model for HH 34 A 3-mode, Variable Velocity Jet Model for HH 34

1998-08-25

arxiv.org/abs/astro-ph/9808280v1

Astronomical Journal (Nov 98)

Astronomy and Astrophysics

Astrophysics

28 pages LaTex, 10 postscript figures

Scientific paper

10.1086/300641

Variable ejection velocity jet models can qualitatively explain the appearance of successive working surfaces in Herbig-Haro (HH) jets. This paper presents an attempt to explore which features of the HH-34 jet can indeed be reproduced by such a model. From previously published data on this object, we find evidence for the existence of a 3-mode ejection velocity variability, and then explore the implications of such a variability. From simple, analytic considerations it is possible to show that the longer period modes produce a modulation on the shorter period modes, resulting in the formation of ``trains'' of multiple knots. The knots observed close to the source of HH-34 could correspond to such a structure. Finally, a numerical simulation with the ejection velocity variability deduced from the HH-34 data is computed. This numerical simulation shows a quite remarkable resemblance with the observed properties of the HH-34 jet.

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