On the applicability of the Rayleigh approximation for coated spheroids in the near-infrared
V.V. Somsikov and
Received 27 July 1998 / Accepted 9 December 1998
Calculations of the extinction and polarization profiles in the wavelength range 2.7-22 µm have been performed for silicate core - icy mantle spheroidal grains using the exact solution to the light scattering problem and the Rayleigh approximation.
It is concluded that the 10% accuracy of the Rayleigh approximation is guaranteed in the case of extinction (polarization) if the particle size does not exceed within the 18 µm, 10 µm and 3 µm bands respectively, where r is the radius of a sphere with the same volume as a spheroid.
Key words: infrared: ISM: lines and bands ISM: dust, extinction polarization scattering
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© European Southern Observatory (ESO) 1999
Online publication: April 12, 1999