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Massive stars becoming red supergiants lose a significant amount of theirmass during that brief evolutionary phase. They then either explode as ahydrogen-rich supernova (SN Type II), or continue to evolve as a hottersupergiant (before exploding). The slow, dusty ejecta of the red supergiantwill be over-run by the hot star wind and/or SN ejecta. I will presentestimates of the conditions for this interaction and discuss some of theimplications.

The effects of red supergiant mass loss on supernova ejecta and the circumburst medium