Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.175..335f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 175, May 1976, p. 335-343.
Physics
10
Angular Momentum, Cloud Physics, Gravitational Collapse, Interstellar Gas, Magnetic Effects, Momentum Transfer, Stellar Evolution, Braking, Cold Gas, Interstellar Magnetic Fields, Stellar Rotation
Scientific paper
The purpose of this investigation is to show that recourse to anisotropic compression along a magnetic field is not a necessary condition for star formation within large collapsing interstellar gas clouds. We examine angular momentum transfer from magnetically braked, cool interstellar gas clouds. Magnetic torques acting on a contracting, rotating cloud, permeated by a frozen-in magnetic field coupling the cloud to the galactic field of the surrounding interstellar medium, produce kinks in the galactic field lines which are radiated away in the form of hydromagnetic waves, thereby rotationally decelerating the cloud. Initially, the braking constraints the clouds to co-rotate with the galactic background until just prior to the epoch of magnetic field uncoupling, when the braking mechanism becomes inefficient and the clouds contract conserving angular momentum thereafter. Our results are shown to be consistent with observations of stellar rotational velocities, and, also, with the angular momentum of the protosun.
Fleck Robert C.
Hunter James H. Jr.
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