The efficiency of interaction of radiation with a particle and hence its optical properties depend on the particle chemical composition, size, shape, structure, etc. ... Particle size expressed in units of the wavelength of incident radiation, together with chemical composition, most strongly affects the optical properties of a scatterer. ... There are many methods to solve the light-scattering problem for a homogeneous spheroid (our survey of the light-scattering methods see here ). ...

Physics of Magnetic Stars, 2007, pp. 262-270 Line profile variability and the possible magnetic field in the spectra of supergiant Leo A.F. Kholtygin1 , G.A. Chountonov2 , S.N. Fabrika2 , T.E. Burlakova Kang Dong-il3 , G.A. Galazutdinov2,4 , M.V. Yushkin2 1 2 2,3 ... Astronomy and Space Science Institute, Optical Astronomy Division, 61-1, Whaam-Dong, YuseongGu, Daejeon, 305-348, Korea 1 Intro duction Line profiles in sp ectra of OB stars are usually strongly variable (Morel et al ...