Resumo

RAGA, A.C.. An analytic, entraining jet model for a stellar outflow in a stratified environment. Rev. mex. astron. astrofis [online]. 2016, vol.52, n.2, pp.311-316. ISSN 0185-1101.

We present a model of a steady, entraining, isothermal jet embedded in a stratified environment. This model is appropriate for describing Herbig-Haro (HH) jets in the outer boundaries of molecular clouds. The model has a straightfoward analytic solution which permits an evaluation of the slowing down of the outflow due to the entrainment of environmental material. The solution indicates that the outflow lobe travelling into regions of lower pressure might or might not be slowed down (depending on the parameters of the flow) before leaving the molecular cloud. On the other hand, the outflow lobe travelling into regions of increasing environmental pressure is likely to be slowed down quite drastically regardless of the flow parameters. The analytic model presented in this paper gives simple recipes for calculating the slowing down of the two outflow lobes.

Palavras-chave : stars: winds, outflows; Herbig-Haro objects; ISM: jets and outflows; ISM: kinematics and dynamics.

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