The dynamical evolution of the protosolar nebula

摘要: Evolutionary models for protostellar nebulae are calculated under the hypothesis that only source turbulent viscosity is thermal convection. The viscous stress approximated by an 'alpha' model, and constant alpha in terms of properties A relatively sensitive dependence Rosseland mean opacity on temperature needed vertical gradient nebula to become convectively unstable. However, this requires optical depth total surface density, as disk depleted matter accretion, drops must This limits amount mass can accretionally process before convective turbulence ceases. resulting evolutionary comparisons with solar system made.