Composition and radiative properties of grains in molecular clouds and accretion disks

  title={Composition and radiative properties of grains in molecular clouds and accretion disks},
  author={James B. Pollack and David J. Hollenbach and Steven V. W. Beckwith and Damon P. Simonelli and Ted L. Roush and Wesley Fong},
  journal={The Astrophysical Journal},
We define a model of the compositon and abundances of grains and gases in molecular cloud cores and accretion disks around young stars by employing a wide range of astronomical data and theory, the composition of primitive bodies in the solar system, and solar elemental abundances. In the coldest portions of these objects, we propose that the major grain species include olivine (Fe, Mg, 2SiO4), orthopyroxene (Fe, Mg, SiO3), volatile and refractory organics, water ice, troilite (FeS), and… 
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