Dust formation in stellar winds. VI. Moment equations for the formation of heterogeneous and core-mantle grains

Astronomy and Astrophysics – Astrophysics

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Dust - Interplanetary Medium - Stars: Circumstellar Matter - Stars: Late Type

Scientific paper

The grains found in interstellar and interplanetary space are well known to often be of amorphous heterogeneous structure. Nevertheless a quantitative theory for the description of the growth of these particles is still missing. We show that the well known moment method for the calculation of dust grain formation can be generalized in order to account also for the formation of heterogeneous dust grains. These include both grains consisting of a mixture of different molecules and the so-called core-mantle grains where different materials condense in layers on the grains. Furthermore we construct a special equilibrium state that allows for the calculation of equilibrium densities of various molecules above composite grain materials. The new equations are applied to dust condensation in the wind of an M giant star.

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