The Lower Main Sequence. UV Ceti Stars M dwarf flare stars About half of M dwarfs are flare stars (and a few K dwarfs, too) A flare star brightens by a few tenths up to a magnitude in V (more in the UV) in a few seconds, returning to its normal luminosity within a few hours
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WC stars (carbon rich)
C/He = 100 x solar or more
Also high oxygen
The more massive star in a binary evolves to the AGB, becomes a peculiar red giant, and dumps its envelope onto the lower mass companion