Grain disruption in interstellar hydromagnetic shocks

Details Grain disruption in interstellar hydromagnetic shocks Grain disruption in interstellar hydromagnetic shocks

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..805s&link_type=abstract

Astrophysical Journal, Part 1, vol. 215, Aug. 1, 1977, p. 805-811.

Other

48

Abundance, Interstellar Gas, Interstellar Matter, Magnetohydrodynamic Waves, Molecular Collisions, Shock Waves, Astronomical Models, Cosmic Plasma, Oao 3

Scientific paper

The observed abundance variations of Ca, Fe, Si, and Ti in intermediate-velocity interstellar gas suggest that grains have been disrupted in clouds with velocities as low as 20 to 50 km/s. A simplified hydromagnetic shock model for such clouds is described; the dynamical equations for charged grains in the postshock region are derived, including the collisional drag and 'betatron-acceleration' effect of a magnetic-field gradient; and the fraction of grains destroyed in evaporative collisions with other grains is calculated. It is found that for shocks of 20 to 50 km/s in which the fractional H-ionization remains low, 3-10% of the grain material may be destroyed - sufficient to explain in part the heavy-element depletion pattern in intermediate velocity clouds and the well-known correlation of N(Ca II)/N(Na I) with cloud velocity.

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