The complex circumstellar environments associated with several of the most luminous cool supergiants provide evidence for episodic high mass loss events. The origin of the high mass loss is not understood but circumstantial evidence strongly suggests that large scale surface activity and magnetic fields are responsible. I briefly review the observational evidence from multi-epoch imaging and spectroscopy for the high mass loss events and instabilities in these stars. New results from high-resolution AO near and mid-IR imaging of VY CMa, IRC+10420 and μ Cep is also presented.
|Original language||English (US)|
|Title of host publication||Betelgeuse Workshop 2012 - The Physics of Red Supergiants|
|Subtitle of host publication||Recent Advances and Open Questions|
|Number of pages||6|
|State||Published - 2013|
|Event||Betelgeuse Workshop 2012 - The Physics of Red Supergiants: Recent Advances and Open Questions - Paris, France|
Duration: Nov 26 2012 → Nov 29 2012
|Name||EAS Publications Series|
|Other||Betelgeuse Workshop 2012 - The Physics of Red Supergiants: Recent Advances and Open Questions|
|Period||11/26/12 → 11/29/12|
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