EDP Sciences
Free access
Volume 493, Number 1, January I 2009
Page(s) 115 - 118
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:200810900
Published online 27 October 2008

A&A 493, 115-118 (2009)
DOI: 10.1051/0004-6361:200810900

Curved Herbig-Haro jets immersed in a stellar wind

A. C. Raga1, J. Cantó2, A. Rodríguez-González1, and A. Esquivel1

1  Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de Mexico, Ap. Postal 70-543, 04510 Mexico, Mexico
    e-mail: [raga;ary, esquivel]@nucleares.unam.mx
2  Instituto de Astronomía, Universidad Nacional Autónoma de Mexico, Ap. Postal 70-468, 04510 Mexico, Mexico

Received 2 September 2008 / Accepted 7 October 2008

Context. Several curved Herbig-Haro (HH) jet/counterjet systems have been observed. Some of these systems are the result of a relative motion between the outflow source and the surrounding environment.
Aims. In this paper, we consider the case of an HH jet/counterjet system that is immersed in an isotropic stellar wind. This situation is somewhat different from the previously studied HH jet/plane-parallel side wind interaction, because the isotropic wind is divergent, and has a radially dependent density structure.
Methods. We present an analytic model for a jet/wind interaction that is based on the balance between the ram pressure of the wind and the centrifugal pressure along the curved jet/counterjet path. We consider the case of an isothermal jet.
Results. We find that, if we have a jet and a wind with similar velocities and mass loss rates, the jet/counterjet system only shows a shallow curvature, with a total deflection angle of only a few degrees. However, if we have stronger winds, quite large deflections are produced (e.g., for the interaction of an HH jet with the wind from an O star). The deflection angle depends on neither the separation between the jet and wind sources nor on the ejection direction of the jet/counterjet.

Key words: ISM: kinematics and dynamics -- ISM: jets and outflows -- ISM: Herbig-Haro objects -- stars: winds, outflows

© ESO 2008