Resumo

CANTO, J.; RAGA, A. C.  e  WILLIAMS, D. A.. The interaction of a YSO outflow with the surrounding molecular cloud core. Rev. mex. astron. astrofis [online]. 2008, vol.44, n.2, pp.293-300. ISSN 0185-1101.

We present a thin shell, analytic model for an outflow ejected with an opening angle that increases as a function of time. This model predicts a cavity shape that broadens out with time, and pinches towards the outflow axis at a point that travels away from the outflow source. The motivation for this model is the set of observations of a bipolar cavity centered on Barnard 5 IRS 1 by Velusamy & Langer (1998), who suggest an interpretation for the observed structure in terms of a model such as the one that we have studied. We find that this observed structure could indeed be produced by an outflow of decreasing collimation as a function of time, provided that the mass loss rate has a value ₀ 3 × 10^-6 yr^-1.

Palavras-chave : ISM: jets and outflows; ISM: kinematics and dynamics; stars: mass loss; stars: pre-main sequence.