| Summary: | 博士 === 國立新竹教育大學 === 應用數學系碩士班 === 97 === The grains' dynamical models are employed to study the density distribution of debris discs. In this thesis, we investigate the effects of β, where β is the value of the ratio between the radiation pressure force and the gravitational, to simulate the Vega's outer disc. We set the particles, in the inner disc, would be collided with each other and be broken into many dust grains when them move. Those dust grains would be blown out, over a long period of time, then they would form the start's outer disc. In the end, we examine whether a model with an 1/R profile could be formed. We find that the model with multiple size of dust grains gives the best fit to the 1/R profile because that (1) the grains with distinct β have distinct radial velocities; (2) the new grains are generated frequently enough to replace those have been blown out. With the above two conditions, models can have a steady out-moving flow with an approximate 1/R profile.
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