Abstract
Grain accretion processes in a protoplanetary nebula have been studied regarding: (a) the distribution function of grain velocities; (b) electrostatic and electromagnetic mechanisms between grains. The velocity distribution function has been investigated for grains embedded in a turbulent gaseous medium. Results have been obtained for protoplanetary nebula densities ranging from 10−19 to 10−13 g cm−3. Considering interactions between two grains, photoelectrically charged by galactic ultraviolet flux and by charged-particle capture, and solid-solid interactions (dipole fluctuation effect), the authors estimate the physical cross section σ (υ) with respect to the geometric one σο. Then a statistical approach for an assembly of grains gives the accretion or destruction rates for these small particles. Therefore, according to their characteristic velocities, the following processes have been studied: rupture, fusion, vaporization.
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Carusi, A., Coradini, A., Federico, C., Fulchignoni, M., Magni, G. (1974). On the Growth Mechanism of Grains in a Primordial Stage of the Solar Nebula. In: Woszczyk, A., Iwaniszewska, C. (eds) Exploration of the Planetary System. International Astronomical Union/Union Astronomique Internationale, vol 65. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2206-4_3
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DOI: https://doi.org/10.1007/978-94-010-2206-4_3
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