Abstract
The evolution of circumstellar matter around a massive star during the red supergiant phase is investigated. It is shown that, if heat conduction is present, the cavity carved around the star during its main-sequence phase may deflate substantially and even disappear completely in extreme cases. It is also found that thermal conduction may cause a shrinking of the cavity already during the main-sequence phase; in this case the bubble tends to settle at a smaller radius. How the evolution of Wolf-Rayet ring nebulae and supernova remnants is affected is considered, and particular astronomical objects such as SN 1987A, the Cygnus Loop, N132D and the WR nebula around HD 197406 are discussed
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