Study of the parameters affecting the collapse of a rotating protostellar cloud

Details Study of the parameters affecting the collapse of a rotating protostellar cloud Study of the parameters affecting the collapse of a rotating protostellar cloud

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........4v&link_type=abstract

Ph.D. Thesis North Carolina State Univ., Raleigh.

Physics

Approximation, Cloud Physics, Protoplanets, Stellar Rotation, Turbulence, Viscosity, Condensation, Finite Difference Theory, Hydrodynamics

Scientific paper

The effect of three different processes--turbulent viscosity, initial rotation rates and random fluctuations in initial density and/or velocity fields on the collapse of an isothermal, rotating protostellar cloud was studied using Eulerian hydrodynamics in finite difference approximation and cylindrical coordinates. Specifically, it was desired to see the influence of these processes in the formation of a centrally condensed core which can eventually lead to a single star. It was found that turbulent viscosity enhances the central condensation, reduces ring radius and the ratio of ring density to central density but, except for very large viscous forces where there is a possibility of prevention ring formation, turbulent viscosity does not suppress rings completely. Turbulence also slows the collapse. Random fluctuations in initial density and/or velocity fields slow the collapse and hinder deep collapse. The effects of fluctuations in either the initial density or velocity or both have similar effects. Fluctuations in both lead to even smaller densities at the center than fluctuations in either one of the initial parameters.

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