A decretion disk is fed near its inner edge and transports mass outward. Rapidly rotating Be stars can sustain gaseous decretion disks whose outer material is removed by a companion, radiation, or a wind.
A Be star is a rapidly rotating B-type star showing Balmer emission from a circumstellar gaseous decretion disk.

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  1. Viscous evolution of an accretion disk
  2. Accretion disk
  3. Astrophysical disk
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