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Astron. Astrophys. 333, 989-1000 (1998)

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Kelvin-Helmholtz instabilities in stellar jets

III. Evolution of spatial perturbations

M. Micono 1, S. Massaglia 1, G. Bodo 2, P. Rossi 2 and A. Ferrari 1, 2

1 Dipartimento di Fisica Generale dell'Università, Via Pietro Giuria 1, I-10125 Torino, Italy (surname@ph.unito.it)
2 Osservatorio Astronomico di Torino, I-10025 Pino Torinese, Italy (surname@to.astro.it)

Received 14 February 1997 / Accepted 2 January 1998

Abstract

We study the effects of radiative losses on the spatial growth of Kelvin-Helmholtz instabilities in supersonic jets. The numerical calculations have been carried out in two spatial dimensions, both in cylindrical and Cartesian (slab) geometry. By comparing the behavior of symmetric modes in the slab and cylindrical cases we obtain some general indications on the influence of the geometry on the instability development. We find that radiation is particularly effective in suppressing matter entrainment in the case of equal density between the jet and the ambient medium. Our results can be applied to the problem of the formation of the emission knots in jets from YSOs.

Key words: hydrodynamics – instabilities – ISM: jets and outflows – stars: main-sequence

Send offprint requests to: S. Massaglia

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© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998

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