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Dust production in the Kuiper Belt and in Vega-like systems C. Dominika aSterrenkundig Instituut "Anton Pannekoek", Universiteit van Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, The Netherlands

We discuss the observed 400 Myr lifetime of Vega-like disks in the frame of a simple analytical model of the collisional evolution of the cometary cloud responsible for the production of the dust. First results show that the 400 Myrs can be explained if the the comets move on highly eccentric and inclined orbits. However, the few old stars which also have a massive dust disk require either less excited orbits in order to allow the dust production to persist for a long time, or a specific event to turn on dust production at a later time.

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