Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.241..417h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 241, Dec. 1, 1989, p. 417-424.
Astronomy and Astrophysics
Astronomy
24
Ambipolar Diffusion, Binary Stars, Heavy Elements, Molecular Clouds, Star Formation Rate, Depletion, Interstellar Magnetic Fields, Thermodynamic Equilibrium
Scientific paper
If the gas-phase heavy-element depletion is high, the fractional ionization in a dense molecular clump increases with increasing depletion. Above a critical number density, which is of the order of 10 to the 7th/cu cm, continued depletion leads to an increase in the fractional ionization and, consequently, in the characteristic time for ambipolor diffusion on a time-scale shorter than the initial ambipolar diffusion time-scale. Hence, quiescent star formation will not occur in very dense magnetically supported clumps. It is noted that the critical number density is comparable to the maximum number density at which magnetic braking of clump rotation could have been efficient during the formation of the shortest period binary star systems.
Hartquist Thomas W.
Williams David. A.
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