Composite Circumstellar Dust Grains
  We calculate the absorption efficiencies of composite silicate grains with
inclusions of graphite and silicon carbide in the spectral range 5--25$\rm \mu
m$. We study the variation in absorption profiles with volume fractions of
inclusions. In particular we study the variation in the wavelength of peak
absorption at 10 and 18$\rm \mu m$. We also study the variation of the
absorption of porous silicate grains. We use the absorption efficiencies to
calculate the infrared flux at various dust temperatures and compare with the
observed infrared emission flux from the circumstellar dust around some M-Type
\& AGB stars obtained from IRAS and a few stars from Spitzer satellite. We
interpret the observed data in terms of the circumstellar dust grain sizes;
shape; composition and dust temperature.
