Refractory grain destruction in low-velocity shocks

Details Refractory grain destruction in low-velocity shocks Refractory grain destruction in low-velocity shocks

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..887c&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 887-892.

Astronomy and Astrophysics

Astrophysics

66

Abundance, Cosmic Dust, Interstellar Matter, Magnetohydrodynamic Waves, Refractory Materials, Shock Wave Propagation, Gas Temperature, Heavy Elements, Interstellar Gas, Magnetic Effects, Magnetic Field Configurations, Particle Acceleration, Propagation Velocity, Silicon, Sputtering

Scientific paper

Recent abundance determinations in intermediate-velocity clouds near the Orion association have shown that silicon abundances may be nearly cosmic even in clouds with a velocity as low as 40 to 50 km/sec. It is argued that grain destruction in radiative shocks traveling perpendicular to the magnetic field may be much more effective than was previously considered. The destruction mechanism consists of acceleration of the gyromotion of the grains about their drift center owing to magnetic field compression, followed by sputtering of the high-velocity grains by He and (CNO) atoms. It is found that MgSiO3 grains may be almost fully destroyed in shocks of velocity greater than 80 km/sec and graphite grains substantially destroyed at shock velocities of 100 km/sec.

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