A yellow hypergiant (YHG) is a massive star with an extended atmosphere, a spectral class from A to K, and, starting with an initial mass of about 20–60 solar masses, has lost as much as half that mass. They are amongst the most visually luminous stars, with absolute magnitudes (MV) around −9, but also one of the rarest, with just 20 known in the Milky Way and six of those in just a single cluster.
A yellow hypergiant (YHG) is a massive star with an extended atmosphere, a spectral class from A to K, and, starting with an initial mass of about 20–60 solar masses, has lost as much as half that mass. They are amongst the most visually luminous stars, with absolute magnitudes (MV) around −9, but also one of the rarest, with just 20 known in the Milky Way and six of those in just a single cluster.
Source: Wikipedia "Yellow hypergiant" · CC BY-SA 4.0
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