Physics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..396s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 1, 1984, p. 396-408.
Physics
12
Ambipolar Diffusion, Interstellar Magnetic Fields, Interstellar Matter, Magnetohydrodynamics, Molecular Clouds, Density Distribution, Gravitational Collapse, Magnetic Effects, Mass Distribution, Nebulae, Protostars, Similarity Theorem, Stellar Evolution, Time Dependence
Scientific paper
The author investigates the quasi-static evolution of plane-parallel slabs which are supported against self-gravity by a magnetic field in the plane of the slab. Such evolution is driven by diffusion of the field relative to the neutral gas; the slab must continuously readjust its structure to maintain hydrostatic equilibrium. First, a highly simplified "one-zone" model is presented to illustrate the basic physics. Next, equations are derived and solutions are obtained, both analytically and numerically, for the evolution of more realistic slabs in which the physical quantities vary as a function of both space and time. The significance of the results for the onset of dynamical collapse of a protostellar cloud and their implications for the location of star formation in such a cloud are discussed.
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