# On Radiation Pressure in Static, Dusty H II Regions

@article{Draine2011OnRP,
title={On Radiation Pressure in Static, Dusty H II Regions},
author={Bruce T. Draine},
journal={The Astrophysical Journal},
year={2011},
volume={732},
pages={100}
}
• B. Draine
• Published 1 March 2010
• Physics
• The Astrophysical Journal
Radiation pressure acting on gas and dust causes H II regions to have central densities that are lower than the density near the ionized boundary. H II regions in static equilibrium comprise a family of similarity solutions with three parameters: β, γ, and the product Q 0 n rms; β characterizes the stellar spectrum, γ characterizes the dust/gas ratio, Q 0 is the stellar ionizing output (photons/s), and n rms is the rms density within the ionized region. Adopting standard values for β and… Expand
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#### References

SHOWING 1-10 OF 32 REFERENCES
The Effects of Dust on Compact and Ultracompact H II Regions
• Physics
• 2004
We calculate numerical models of dusty H II regions using the Cloudy photoionization code with a grain size distribution. Dust sublimation causes a depletion of grain sizes and types within theExpand
The size-density relation of extragalactic H II regions
Aims. We investigate the size-density relation in extragalactic H ii regions, with the aim of understanding the role of dust and different physical conditions in the ionized medium. Methods. First,Expand
Spatial Distribution of Dust Grains within H II Regions
We discuss the dust distribution within photoionized regions. Assuming a geometry with a central dust cavity, which is strongly suggested by the literature, we can estimate the cavity radius from theExpand
THE DYNAMICS OF RADIATION-PRESSURE-DOMINATED H II REGIONS
• Physics
• 2009
We evaluate the role of radiation pressure in the dynamics of H II regions. We first determine under what conditions radiation pressure is significant in comparison to gas pressure and show that,Expand
On the physics of dust grains in hot gas.
• Physics
• 1979
Charging of dust grains in hot (10/sup 4/--10/sup 9/ K) plasma is studied, including photoelectron and secondary electron emission, field emission, and transmission of electrons and ions through theExpand
Compact H II Regions: What Lies Within?
This paper presents both stellar mass and H ii region diagnostics based on dusty, radiation-pressure-dominated photoionization models for compact and ultracompact H ii regions, and compares theseExpand
Internal Dust Correction Factors for Star Formation Rates Derived for Dusty \HII Regions and Starburst Galaxies
• Physics
• 2003
Star formation rates in galaxies are frequently estimated using the Balmer line fluxes of their H II regions. However, these can be systematically underestimated because dust competes for theExpand
Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints
• Physics, Environmental Science
• 2003
We present new interstellar dust models that have been derived by simultaneously fitting the far-ultraviolet to near-infrared extinction, the diffuse infrared (IR) emission and, unlike previousExpand
The Bubbling Galactic Disk
A visual examination of the images from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) has revealed 322 partial and closed rings that we propose represent partially or fullyExpand
High spatial resolution radio continuum observations of compact H II regions in the Magellanic Clouds
• Physics
• 2005
We present high spatial resolution observations of the 6 cm continuum emission of compact H.. regions in well-known sites of massive star formation located in the Small and Large Magellanic Clouds.Expand