A comparison of two independent calculations of the axisymmetric collapse of a rotating protostar

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gravitational Collapse, Protostars, Stellar Evolution, Stellar Rotation, Computerized Simulation, Stellar Models

Scientific paper

Two entirely different numerical computer codes for calculating self-gravitating axisymmetric flows with rotation are compared. The case considered is the isothermal collapse of a 1-solar mass cloud with initial density of 1.38 x 10 to the -18th g/cu cm and angular velocity of 6.08 x 10 to the -13th per sec; the collapse is followed beyond 10 free-fall times in order to allow transient structures, which may dominate locally, to damp out. For both codes the final model is found to be a low-density equilibrium configuration rather than a centrally condensed protostar. It is concluded that the formation of ring structures in collapsing clouds with rotation is a real phenomenon.

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