Disorientation of interstellar grains in suprathermal rotation

Details Disorientation of interstellar grains in suprathermal rotation Disorientation of interstellar grains in suprathermal rotation

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..417s&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 417-424.

Astronomy and Astrophysics

Astrophysics

69

Angular Momentum, Cosmic Dust, Disorientation, Granular Materials, Interstellar Matter, Computer Programs, Crossovers, Kinetic Energy, Mathematical Models, Paramagnetism, Torque

Scientific paper

Suprathermal rotation of an interstellar dust grain that is dynamically symmetric about the z axis is analyzed in the case where the torque, measured in body axes, is strictly constant. The cumulative deflection angle of the grain's angular momentum during crossover (torque reversal) is computed by using both a simple theoretical model and detailed dynamical computer calculations. The results suggest that disorientation is relatively complete in two to three crossovers. It is concluded that paramagnetic relaxation theory can easily explain grain orientation only if 'long-lived spinup' and infrequent crossovers are assumed.

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