General constraints on the average scattering characteristics of interstellar grains in the ultraviolet

Details General constraints on the average scattering characteristics of interstellar grains in the ultraviolet General constraints on the average scattering characteristics of interstellar grains in the ultraviolet

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.210..791c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 210, Oct. 15, 1984, p. 791-801.

Astronomy and Astrophysics

Astronomy

16

Grain Size, Interstellar Extinction, Interstellar Matter, Mie Scattering, Ultraviolet Spectra, Astronomical Models, Cloud Cover, Constraints, Optical Properties, Radiant Flux Density

Scientific paper

The sizes and optical properties of interstellar grains broadly determined by the full interstellar extinction law extending from infrared to ultraviolet wavelengths lead to rather strict constraints on the average scattering characteristics of grains in the ultraviolet. The presence of relatively large (radii of about 0.1-0.2 microns) grains implied by the visual extinction is the key to determining the maximum and minimum values of the average albedo mean value-alpha and the scattering asymmetry mean value-g in the ultraviolet. Additional restrictions on the values of mean value-alpha and mean value-g are derived from the most basic physical properties of the small particle population. This procedure produces a range of possible pairs of mean value-alpha and mean value-g at each UV wavelength, which in turn provides a basis for critical evaluation of grain models and results derived from direct measures of scattered light.

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