Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..213p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 213-226. Research supported by the Johns Hopkins Unive
Astronomy and Astrophysics
Astrophysics
16
Gas Ionization, Interstellar Matter, Molecular Clouds, Protostars, Star Formation, Aluminum 26, Astronomical Models, Ion Motion, Magnetic Effects, Plasma Layers, Radioactive Decay
Scientific paper
The authors present a theory for the early evolution of contracting magnetized flattened clouds in molecular clouds which undergo magnetic braking and field slip (ambipolar diffusion). If magnetic torques are the means by which angular momentum is removed from disks, then accretion rates and protostellar masses depend on how efficient braking is with respect to field line slip and hence can depend sensitively on ionization conditions. The authors discuss homologously evolving structures and calculate the evolution of the disk rotation frequency, toroidal field, accretion velocity, accretion rate, and core mass. It is found that cores which accrete out of very weakly ionized pancakes may have their masses increased by factors of 5 - 10 by increasing the ionization rate of the material by a decade.
Pudritz Ralph E.
Silk Joseph
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