Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..347b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Nov. 1977, p. 347-363.
Astronomy and Astrophysics
Astrophysics
9
Astrophysics, Interstellar Gas, Stellar Mass Accretion, Astronomical Models, Magnetohydrodynamic Turbulence, Stellar Evolution
Scientific paper
An attempt is made to present an analysis of nearly collisionless gas accretion onto a star. Attention is given to the inevitability of a bound cusp, a self-similar distribution function, the dynamics and structure of a cusp, and effects of a cusp on the accretion process. Some ambient distribution is examined, an ambient distribution function is derived, and an exact expression for the accretion rate due to that distribution is obtained. A collisionless-to-fluid transition is studied for hard spheres and for particles of Coulomb cross section. The results are taken to indicate that Coulomb collisions will often be inadequate to guarantee fluidlike behavior and that some other fluidizing agent, such as turbulence or tangled magnetic fields, must be invoked.
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