Multigrain Dust Cloud Nodels of Compact HII Regions

Details Multigrain Dust Cloud Nodels of Compact HII Regions Multigrain Dust Cloud Nodels of Compact HII Regions

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..212e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 266, NO. 1/JAN, P. 212, 1994

Astronomy and Astrophysics

Astronomy

18

Radiative Transfer - Circumstellar Matter - Ism: Clouds - Dust, Extinction - H Ii Regions - Infrared: Ism: Lines And Bands

Scientific paper

We present a generalization of the method of Efstathiou & Rowan-Robinson for the solution of the radiative transfer problem in dust clouds that takes into account a distribution of grain species and sizes. The method includes treatment of multiple scattering from grains and can be applied to axisymmetric density distributions. In this paper, however, we restrict our attention to the special case of spherical symmetry. We find that, in the parameter space we have explored, composite grains with `average' absorption and scattering efficiencies approximate very well the emission from the grain mixture of Rowan-Robinson.
We also re-examine the sample of compact H II regions of Crawford & Rowan-Robins on, and find that the combined effect of the multigrain calculations and a new model for interstellar grains by Rowan-Robinson is to improve considerably the agreement of models that assume high-optical-depth (Aν ≍ 20-200) homogeneous clouds around hot stars with the IRAS data.
For four objects we are able to compare our models with submillimetre data (350-1300 μm). For W3(OH) the fit is good, but for the other three objects the models predict too much flux at long wavelengths. Possible reasons for this are discussed.

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