Nonlinear evolution of protostellar disks and light modulations in young stellar objects

Details Nonlinear evolution of protostellar disks and light modulations in young stellar objects Nonlinear evolution of protostellar disks and light modulations in young stellar objects

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nyasa.617..142l&link_type=abstract

(Nonlinear astrophysical fluid dynamics; Proceedings of the 5th Florida Workshop in Nonlinear Astronomy, Gainesville, FL, Oct. 5

Physics

Fluid Dynamics

Accretion Disks, Protostars, Stellar Evolution, Stellar Mass Ejection, Dynamic Models, Gravitational Waves, Light Modulation, Stellar Models

Scientific paper

An evolutionary model of dynamical processes in protostellar disks is described and illustrated with graphs of typical results. The effective transport mechanisms are discussed, including thermal convection, nonaxisymmetric gravitational instabilities in the outer regions of disks, and wave propagation. Consideration is then given to the stages of dynamical evolution, FU Ori outburst phenomena, unsteady accretion-disk flows, and nonlinear feedback as a mechanism to modulate mass transfer. The simulations show that mass redistribution is determined by angular-momentum transfer, which in turn is regulated by the effective viscosity generated by convectively driven turbulence. Significant mass transfer occurs as a result of mixing of infalling material with disk gas and is affected by the tidal torque associated with the growth of nonaxisymmetric disturbances in the outer disk. The time scale for disk evolution is found to be about 1 Myr.

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