Resumo

RODRIGUEZ-RAMIREZ, J. C.  e  RAGA, A. C.. The expansion of a stellar wind bubble within a non-singular, stratified core. Rev. mex. astron. astrofis [online]. 2012, vol.48, n.2, pp.235-242. ISSN 0185-1101.

We study analytically the expansion of a non-radiative bubble (driven by the wind from a massive star) into an environment with a non-singular, self-gravitating isothermal sphere density stratification. We derive the equation of motion for the outer radius of the bubble (using the assumptions of the classical analytic model for expanding bubbles, but allowing the outer shock to have the appropriate strong/weak shock transition). The model equation has a single dimensionless parameter that determines whether or not the outer shock becomes weak. We find that O star bubbles within dense, stratified molecular cloud cores (possibly associated with some of the observed ultracompact HII regions) are in the "strong shock'' limit.

Palavras-chave : ISM [evolution]; ISM [kinematics and dynamics]; stars [formation].

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