Magnetic braking during star formation. III

Statistics – Computation

Scientific paper

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42

Angular Momentum, Braking, Hydrogen Clouds, Magnetic Effects, Momentum Transfer, Star Formation, Astronomical Models, Cosmology, Free Fall, Gravitational Collapse, Magnetic Clouds, Stellar Models

Scientific paper

Previous computations yielded plausible upper limits to the instantaneous rate of angular-momentum transport from a rotating magnetic cloud. It is found that a cloud of mass greater than the critical mass set by its magnetic flux tends to contract in approximate magneto-centrifugo-gravitational equilibrium and in a time fixed by the efficiency of magnetic braking rather than in the gravitational free-fall time. A cloud of mass below the critical mass contracts on a time scale determined by the rate at which flux leaks out of the cloud; if this time is longer than the free-fall time, the magnetic stresses are able to remove much more angular momentum, maintaining the slowly contracting cloud in approximate corotation with its surroundings. The consequences of these conclusions for cosmogony are briefly discussed

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