Abstract
view Abstract Citations (63) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Grain disruption in interstellar hydromagnetic shocks. Shull, J. M. Abstract 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. Publication: The Astrophysical Journal Pub Date: August 1977 DOI: 10.1086/155417 Bibcode: 1977ApJ...215..805S Keywords: Abundance; Interstellar Gas; Interstellar Matter; Magnetohydrodynamic Waves; Molecular Collisions; Shock Waves; Astronomical Models; Cosmic Plasma; Oao 3; Astrophysics full text sources ADS |
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