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Abstract: We present some important conclusions from recent calculations pertaining tothe collapse of rotating molecular cloud cores with axial symmetry,corresponding to evolution of young stellar objects through classes 0 and beginof class I. Three main issues have been addressed: 1 The typical timescalefor building up a preplanetary disk - once more it turned out that it is of theorder of one free-fall time which is decisively shorter than the widely assumedtimescale related to the so-called -inside-out collapse-; 2 Redistribution ofangular momentum and the accompanying dissipation of kinetic rotationalenergy - together these processes govern the mechanical and thermal evolutionof the protostellar core to a large extent; 3 The origin ofcalcium-aluminium-rich inclusions CAIs - due to the specific pattern of theaccretion flow, material that has undergone substantial chemical andmineralogical modifications in the hot exceeding 900 K interior of theprotostellar core may have a good chance to be advectively transported outwardinto the cooler remote parts beyond 4 AU, say of the growing disk and tosurvive there until it is incorporated into a meteoritic body.



Author: W. M. Tscharnuter, J. Schönke, H.-P. Gail, E. Lüttjohann

Source: https://arxiv.org/



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