why are supergiants called supergiants
They are evolved, expanded, massive and luminous stars like supergiants, but at the most massive and luminous extreme, and with particular additional properties of undergoing high mass-loss due to their extreme luminosities and instability.uch early O-type supergiants share many features with WNLh WolfâRayet stars and are sometimes designated as slash stars, intermediates between the two types. Luminous blue variables (LBVs) are a type of star that occur in the same region of the HR diagram as blue supergiants, but are generally classified separately.