Grains accretion processes in a protoplanetary nebula Conducting and insulating materials

Details Grains accretion processes in a protoplanetary nebula Conducting and insulating materials Grains accretion processes in a protoplanetary nebula Conducting and insulating materials

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..33..369c&link_type=abstract

Astrophysics and Space Science, vol. 33, Apr. 1975, p. 369-384.

Astronomy and Astrophysics

Astrophysics

10

Interstellar Matter, Particle Interactions, Planetary Evolution, Chemical Composition, Collision Parameters, Conductors, Electromagnetic Interactions, Graphite, Insulators, Iron, Silicon Dioxide, Velocity Distribution

Scientific paper

The behavior of conducting (iron and graphite) and insulating (silica) grains is analyzed to determine the physical conditions under which accretion processes occur and the dependence of such processes on probable particle materials. The short-range electromagnetic interaction between grains is analyzed on the basis of the electromagnetic fluctuation theory, electrostatic interactions are examined for oppositely and similarly charged insulating and conducting grains, and an expression is obtained for the impact energy balance. Physical conditions in a protoplanetary nebula are described, and constructive and destructive cross sections are estimated for grain interactions. It is concluded that the chemical composition of grains may be of very critical significance, that a 'hierarchical accumulation' is not very likely, and that an equilibrium state between constructive and destructive collisions can be reached as the grain mass increases.

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