A review of recent observations of dust in H II regions

Details A review of recent observations of dust in H II regions A review of recent observations of dust in H II regions

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..34...49s&link_type=abstract

(Symposium on Solid State Astrophysics, Cardiff, Wales, July 9-12, 1974.) Astrophysics and Space Science, vol. 34, Apr. 1975, p.

Astronomy and Astrophysics

Astronomy

1

Absorption Cross Sections, Cosmic Dust, H Ii Regions, Hydrogen Ions, Interstellar Extinction, Albedo, Interstellar Gas, Interstellar Radiation, Nebulae, Radio Astronomy, Ultraviolet Absorption

Scientific paper

The upper limit for the absorption cross section of dust in H II regions in the wavelength range 912-504 A derived by Mezger et al. (1974), is compatible with that expected for large dust grains, and a gas-to-dust ratio equal to that in the general interstellar medium. The albedo of the small grains must be high for wavelengths above 504 A. This restriction is lifted if the visual extinction cross section of the grains in H II regions is less than that for grains in the general interstellar medium. New observations of the Orion Nebula indicate that the visual extinction cross section is within a factor two of the value in the general interstellar medium.

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