AAS Meeting #193 - Austin, Texas, January 1999
Session 17. Jets and Herbig-Haro Objects
Display, Wednesday, January 6, 1999, 9:20am-6:30pm, Exhibit Hall 1

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[17.05] A 3-mode, variable velocity jet model for HH 34

A. Noriega-Crespo (IPAC Caltech-JPL), A.C. Raga (IAUNAM)

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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