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Title:
Disruption and sputtering of grains in intermediate-velocity interstellar clouds
Authors:
Shull, J. M.
Affiliation:
AA(Colorado, University; Joint Institute for Laboratory Astrophysics, Boulder, Colo.)
Publication:
Astrophysical Journal, Part 1, vol. 226, Dec. 15, 1978, p. 858-862. (ApJ Homepage)
Publication Date:
12/1978
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmic Dust, Interstellar Matter, Particle Collisions, Sputtering, Clouds, Cosmic Plasma, Grains, Gyration, Magnetic Effects, Velocity Distribution
DOI:
10.1086/156666
Bibliographic Code:
1978ApJ...226..858S

Abstract

Numerical models of grain sputtering and disruption by grain-grain collisions in intermediate-velocity (50-120 km/s) interstellar clouds are presented. The grain's gyromotion about the magnetic field may be increased by field compression behind a radiating shock, but the presence of collisional and plasma drag limits the effectiveness of this mechanism to dense grains of radius about 10 millionths cm. At velocities of about 100 km/s, approximately half the Fe and MgSiO3 grains entering the cloud may be destroyed, providing a plausible explanation for the recently observed pattern of refractory element depletion in intermediate-velocity gas.

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