The diffusion of contaminant through an accretion disc

Statistics – Computation

Scientific paper

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Accretion Disks, Computational Astrophysics, Angular Momentum, Chemical Evolution, Density Distribution, Diffusion, Radial Flow, Time Dependence, Trace Contaminants, Viscosity

Scientific paper

The authors calculate the manner in which a trace contaminant diffuses through an accretion disc. For a steady disc in which the ratio of diffusivity to viscosity, ζ, is taken to be constant through the disc and for which the surface density distribution is taken to be a power law (Σ ∝ R-α) the authors present analytic solutions to the time-dependent equations governing contaminant evolution. They calculate the amount of contaminant which can diffuse its way outwards against the bulk inward accretion flow and show that this is a sensitive function of α and ζ.

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