On the properties of dust grains in H II regions

Details On the properties of dust grains in H II regions On the properties of dust grains in H II regions

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mmsai..49..213p&link_type=abstract

(Società Astronomica Italiana, Conference on Infrared Astronomy, 1st, Lecce, Italy, Sept. 22-24, 1977.) Società Astronomica Ital

Astronomy and Astrophysics

Astronomy

Cosmic Dust, H Ii Regions, Infrared Absorption, Photoabsorption, Plasma Clouds, Radio Attenuation, Abundance, Astronomical Models, Granular Materials, Hydrogen Ions, Interstellar Extinction, Lyman Alpha Radiation

Scientific paper

Infrared and radio data from H II regions are analyzed with the aid of theoretical models. It is found that: (1) dust absorbs a substantial fraction of Lyman continuum radiation; (2) in the ionized region the dust opacity, and hence the dust abundance relative to the gas, is not the same for all sources; (3) the differences in dust abundance from region to region can easily be explained by the presence of large amounts of a dust component with low melting temperature in addition to other components that are much more resistant; and (4) a wavelength-dependent dust absorption cross section is sufficient to explain the observed decrease in He ionization with increasing values of the ratio of IR to Ly-alpha luminosity.

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