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Kelvin-Helmholtz Instabilities and the Emission Knots in Herbig-Haro Jets

Published online by Cambridge University Press:  25 May 2016

S. Massaglia ,
M. Micono ,
A. Ferrari ,
G. Bodo  and
P. Rossi
S. Massaglia
Affiliation:
Dipartimento di Fisica Generale dell'Università, Via Pietro Giuria 1, I-10125 Torino, Italy
M. Micono
Affiliation:
Dipartimento di Fisica Generale dell'Università, Via Pietro Giuria 1, I-10125 Torino, Italy
A. Ferrari
Affiliation:
Dipartimento di Fisica Generale dell'Università, Via Pietro Giuria 1, I-10125 Torino, Italy
G. Bodo
Affiliation:
Osservatorio Astronomico di Torino, Strada dell'Osservatorio 20, I-10025 Pino Torinese, Italy
P. Rossi
Affiliation:
Osservatorio Astronomico di Torino, Strada dell'Osservatorio 20, I-10025 Pino Torinese, Italy

Abstract

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We discuss the non-linear evolution of Kelvin-Helmholtz instabilities in Herbig-Haro jets performing numerical simulations by means of a PPM hydro-code modified as to include non-equilibrium, optically thin, radiation losses and heating. In this paper we discuss in particular the effects of different functional dependences of heating on density. The results obtained show a weak dependency of the instability evolution on the different forms of the heating function, that is largely unknown, therefore the simple assumption of constant heating, adopted in previous papers on this matter, does not lead to severe limitations on the general applicability of the results to the astrophysical jets and, in particular, to the origin of the emission knots.

Type
III. Theoretical Models
Information
Symposium - International Astronomical Union , Volume 182: Herbig-Haro Flows and the Birth of Low Mass Stars , 1997 , pp. 335 - 342
Copyright
Copyright © Kluwer 1997 

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