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Paper: Links Between Hot Stars and Their Disks
Volume: 337, The Nature and Evolution of Disks Around Hot Stars
Page: 178
Authors: Rivinius, Th.
Abstract: The lifecycles of classical Be star disks are reviewed from an observer's point of view, presenting the spectroscopic evidence concerning the disk formation, evolution, and dissipation. With the exception of hydrodynamic processes during the gradual evolution, all these phases are driven or influenced rather directly by stellar processes. For the disk formation, the stellar processes concerned are rotation, pulsation, and possibly magnetic fields. In particular, the question of what fraction is contributed by rotation has been re-opened recently. The disk formation proper, the outburst, has been observed as being a discrete rather than steady process. During the outburst the direct physical connection between star and disk also influences the stellar variability itself. Once the outburst ends, the disk enters a phase of gradual outward evolution. With time, the inner regions of the disk become thinner, turning the disk into a ring with an increasing inner radius. If not replenished by subsequent outbursts, the disk will finally dissipate into the interstellar gas.

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