An analytic model of dusty, stratified, spherical H II regions

• Verfasst von: Rodríguez-Ramírez, Juan Carlos [VerfasserIn]
• Verfasst von: Lora, Verónica [VerfasserIn]
• Titel: An analytic model of dusty, stratified, spherical H II regions
• Verf.angabe: J.C. Rodríguez-Ramírez, A.C. Raga, V. Lora, and J. Cantó
• E-Jahr: 2016
• Jahr: 2016 December 20
• Umfang: 8 S.
• Teil: volume:833
• Teil: year:2016
• Teil: number:2
• Teil: extent:8
• Fussnoten: Gesehen am 27.10.2017
• Titel Quelle: Enthalten in: The astrophysical journal / 1
• Ort Quelle: London : Institute of Physics Publ., 1996
• Jahr Quelle: 2016
• Band/Heft Quelle: 833(2016,2) Artikel-Nummer 256, 8 Seiten
• ISSN Quelle: 1538-4357
• DOI: doi:10.3847/1538-4357/833/2/256
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564837483

Abstract

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.