Red/Yellow Supergiant
These stars most super giants are cooling and expand rapidly toward the red super-giants after the main change. This is only a few thousand years in the phase, and are less common than red super giants. These stars burn hydrogen in a shell after letting the hydrogen go in their cores helium ignites smoothly after the development of the red super giants. but there is no certainty that this occurs during the red super giant stage or the yellow super giant.
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