Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984em%26p...30...99m&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 30, Feb. 1984, p. 99-103.
Astronomy and Astrophysics
Astrophysics
9
Comets, Fragmentation, Interplanetary Dust, Micrometeoroids, Ice, Magnetite, Obsidian
Scientific paper
Catastrophic fracture of heterogeneous grains consisting of refractory matrix and trapped icy inclusions is examined. As such a grain approaches the sun after release from the comet, the saturation pressure of icy inclusions increases, and finally exceeds the crack-extension-force necessary for onset of unstable fast fracturing. Subsequently a growth of cracks results in a fracture of the grain. The calculation revealed that obsidian and magnetite grain, respectively, of radius 100 microns with 10 percent water-ice inclusions in volume suddenly disrupt near the solar distance of 0.25 AU and of 0.6 AU. Since the small debris of fragmentation comes from the direction of the sun on a relatively higher eccentric orbit, this fragmentation mechanism seems favorable to explain the beta-meteoroids observed at 1 AU.
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