The effect of turbulent viscosity on stability and collapse of a rotating protostellar cloud

Details The effect of turbulent viscosity on stability and collapse of a rotating protostellar cloud The effect of turbulent viscosity on stability and collapse of a rotating protostellar cloud

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89...61r&link_type=abstract

Astronomy and Astrophysics, vol. 89, no. 1-2, Sept. 1980, p. 61-66.

Astronomy and Astrophysics

Astrophysics

6

Protostars, Stellar Evolution, Turbulence Effects, Agglomeration, Angular Momentum, Dynamic Stability, Gravitational Collapse, Momentum Transfer, Perturbation Theory, Rotating Bodies

Scientific paper

The effects of turbulent eddy viscosity on the onset of instability and the formation of toroidal structures during the collapse of a rotating protostellar cloud are investigated. A linear stability analysis is presented for an idealized, uniform, infinite isothermal medium with uniform rotation including the effects of turbulence on perturbation growth scale and rate. A characteristic scale length for the gravitationally unstable subregions is obtained, and an instability with a growth rate significantly longer than the free fall time is found in the case when the angular velocity is above critical and the configuration without turbulent viscosity is stable. It is proposed that such a viscosity-induced instability can aid in explaining the formation of observed very massive clouds by agglomeration. In addition, the turbulent transport of angular momentum during the collapse of a rotating ring is found likely to reduce the probability of the formation of a ring in the central portion of the equatorial plane of the cloud.

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