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oai:www.ideals.illinois.edu:2142/20927 2023-07-10 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

Mouschovias, T. Ch. Basu, Shantanu 2011-05-07T12:53:20Z 2011-05-07T12:53:20Z 10000-01-01 1993 The means by which parent molecular clouds give birth to stars constitutes a fundamental unsolved problem in astrophysics. Magnetic fields, which dominate thermal-pressure as a source of support against self-gravity in interstellar molecular clouds, are an important regulator of star-formation. We study the formation and contraction of fragments (or cores) in isothermal, rotating, magnetic molecular clouds. Initial states are exact equilibria with magnetic, centrifugal, and thermal-pressure forces balancing self-gravity. The full nonlinear two-fluid MHD equations for a flattened disk are solved numerically to obtain the cloud's evolution. The evolution of the model clouds is initiated entirely by the onset of magnetic braking (the transport of angular momentum by torsional Alfven waves) and ambipolar diffusion (the relative drift between neutral and charged particles). A core forms and ultimately evolves much more rapidly than the surrounding cloud. A core-envelope separation is demonstrated, and the final mass and angular momentum of the core is determined. Predictions are made for the spatial profiles of important physical quantities, e.g., angular velocity, density, magnetic field. A full parameter study is conducted. Made available in DSpace on 2011-05-07T12:53:20Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9411564.pdf: 6364137 bytes, checksum: 95fac4714f022b7cb15dd49539bf4d01 (MD5) Previous issue date: 1993 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:47:19Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:21:20-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9411564 (UMI)AAI9411564 http://hdl.handle.net/2142/20927 eng Copyright 1993 Basu, Shantanu Physics, General Physics, Astronomy and Astrophysics The role of magnetic braking and ambipolar diffusion in the formation of interstellar cloud cores and protostars text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.