The evolution of circumstellar matter around an isolated massive star during the red supergiant phase - The role of heat conduction

Astronomy and Astrophysics – Astronomy

Scientific paper

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Conductive Heat Transfer, Massive Stars, Red Giant Stars, Stellar Envelopes, Stellar Evolution, Supergiant Stars, Cavities, Main Sequence Stars, Stellar Coronas, Supernova Remnants, Wolf-Rayet Stars

Scientific paper

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. I also find 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. I consider how the evolution of Wolf-Rayet ring nebulae and supernova remnants is affected, and discuss particular astronomical objects such as SN 1987A, the Cygnus Loop, N132D and the WR nebula around HD 197406.

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