Physics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..146w&link_type=abstract
Nature (ISSN 0028-0836), vol. 320, March 13, 1986, p. 146-148.
Physics
6
Cool Stars, Interplanetary Dust, Poynting-Robertson Effect, Stellar Mass Accretion, Heating, Particle Motion, Stellar Gravitation, Stochastic Processes, Interplanetary Dust, Cosmic Dust, Fluctuations, Drag, Aerodynamics, Grains, Thermal Effects, Heating, Fragments, Distribution, Collisions, Fragmentation, Dust, Accretion, Calculations
Scientific paper
Stochastic forces on circumsolar grains arise from low-frequency fluctuations in surface charge and interplanetary fields. The author shows that stochastic heating can balance and indeed overwhelm the dissipative Poynting-Robertson drag for small grains (⪉1 μm scale radius). Furthermore, the consequent drift to the outer Solar System may cancel the strong collisional source inferred for micrometre and sub-micrometre fragments, explaining how their present distribution is stable in time. More generally, the stochastic heating mechanism combined with collisional fragmentation sets limits on dust accretion onto cool stars.
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