= Decretion disk
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A \b[<decretion disk>] is supplied near its inner edge and transports matter outward. Internal <stresses> redistribute the supplied <angular momentum> through a nearly orbiting flow. Classical <Be stars> provide an example: their gaseous circumstellar disks are modeled as viscously spreading, approximately <Keplerian disks>. A disk carrying an outward <torque> is not automatically a <decretion disk>; it must actually have outward <mass> transport.<Classical Be stars by Thomas Rivinius and others>[Abstract and review of viscous decretion disks]{ref}
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