AN ANALYTIC MODEL OF DUSTY, STRATIFIED, SPHERICAL H II REGIONS
Por:
Rodriguez-Ramirez, J. C., Raga, A. C., Lora, V., Canto, J.
Publicada:
20 dic 2016
Resumen:
We study analytically the effect of radiation pressure (associated with
photoionization processes and with dust absorption) on spherical,
hydrostatic H II regions. We consider two basic equations, one for the
hydrostatic balance between the radiation- pressure components and the
gas pressure, and another for the balance among the recombination rate,
the dust absorption, and the ionizing photon rate. Based on appropriate
mathematical approximations, we find a simple analytic solution for the
density stratification of the nebula, which is defined by specifying the
radius of the external boundary, the cross section of dust absorption,
and the luminosity of the central star. We compare the analytic solution
with numerical integrations of the model equations of Draine, and find a
wide range of the physical parameters for which the analytic solution is
accurate.
Filiaciones:
Rodriguez-Ramirez, J. C.:
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, AP 70-543, Mexico City 04510, DF, Mexico
Raga, A. C.:
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, AP 70-543, Mexico City 04510, DF, Mexico
Lora, V.:
Zentrum Astron Univ, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany
Canto, J.:
Univ Nacl Autonoma Mexico, Inst Astron, Ap 70-468, Mexico City 04510, DF, Mexico
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