Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.126..155m&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 126, no. 1, Oct. 1986, p. 155-165.
Astronomy and Astrophysics
Astrophysics
6
Interstellar Matter, Light Scattering, Polarization Characteristics, Graphite, Ice, Mie Scattering, Rayleigh Scattering, Refractivity, Silicates
Scientific paper
On the basis of the Mie theory, the differential cross section for polarization and the polarization efficiency are calculated for some spherical interstellar grains consisting of ice, silicate, or graphite in the ultraviolet, optical, and near-infrared wavelengths. As far as the polarization due to scattering is concerned, these particles scatter light as Rayleigh scattering for x greater than 0 but less than about 1, where x is the dimensionless size parameter. The polarization efficiencies depend strongly on the value of the imaginary part of the refractive index of the grain material when x is much smaller than unity: the efficiency takes a maximum value when x is about 1 and decreases to zero as x approaches zero for the absorbing sphere, such as the dielectric particle with the value of the imaginary part of about 0.1, or the graphite grain.
Matsumura Masafumi
Seki Munezo
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