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Shock processing of interstellar grains
Seab, C. G.; Shull, J. M.
AA(NASA, Ames Research Center, Moffett Field, CA; Joint Institute for Laboratory Astrophysics, Boulder, CO), AB(Joint Institute for Laboratory Astrophysics, Boulder, CO)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 15, 1983, p. 652-660. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astronomical Models, Cosmic Dust, Interstellar Matter, Nebulae, Shock Waves, Supernova Remnants, Chemical Composition, Interstellar Extinction, Iue, Particle Collisions, Particle Size Distribution, Sputtering
Bibliographic Code:


Theoretical and observational evidence is presented that shock processing of interstellar dust grains by supernova blast waves affects both heavy element depletions and ultraviolet extinction curves. By coupling a realistic model of grain sizes and populations with a radiative shock code, significant grain destruction at velocities as low as 40 km/s is demonstrated. Nonthermal sputtering and grain-grain collisions destroy relatively more large grains than small, and more silicates than graphite. Consequently, both the 2175 A extinction 'bump' and the far-ultraviolet normalized extinction are increased in strength. Ultraviolet extinction studies with the International Ultraviolet Explorer of nine stars near three supernova remnants (the Monoceros Loop, Shajn 147, and Vela) exhibit strong 2175 A bumps and normal or high far-ultraviolet extinction. Diffuse bands, if they are created by small grains, should show little correlation with such activity.

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