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Yellow hypergiant
Generally speaking, a yellow hypergiant is a very massive star with an extended atmosphere, which can be classified as spectral Class G, with a mass of as much as 120 solar masses (believed to be the upper limit of stellar mass). Yellow hypergiants, such as Rho Cassiopeiae in the constellation Cassiopeia, have been observed to experience periodic eruptions, resulting in periodic or continuous dimming of the star, respectively.
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