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A hypergiant (luminosity class 0 or Ia +) is a very rare type of star that has an extremely high luminosity, mass, size and mass loss because of its extreme stellar winds.The term hypergiant is defined as luminosity class 0 (zero) in the MKK system.
Intrinsic variable types in the Hertzsprung–Russell diagram showing the Yellow Hypergiants above (i.e. more luminous than) the Cepheid instability strip. 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.
Some red supergiants are larger and more luminous, with radii exceeding over a thousand times that of the Sun. These are hence also referred to as red hypergiants: Mu Cephei; VV Cephei A; NML Cygni; S Persei; UY Scuti; VY Canis Majoris; Westerlund 1 W26; WOH G64: transitioned into a yellow hypergiant in 2014. [33] KY Cygni; BI Cygni
HR 5171, also known as V766 Centauri, is a yellow hypergiant in the constellation Centaurus. It is said to be either an extreme red supergiant (RSG) or recent post-red supergiant (Post-RSG) yellow hypergiant (YHG), both of which suggest it is one of the largest known stars. The star's diameter is uncertain but likely to be between 1,100 and ...
Red giants vary in the way by which they generate energy: most common red giants are stars on the red-giant branch (RGB) that are still fusing hydrogen into helium in a shell surrounding an inert helium core; red-clump stars in the cool half of the horizontal branch, fusing helium into carbon in their cores via the triple-alpha process
Late-life depression is often underdiagnosed, which is due to numerous reasons, including that depressed mood is commonly not as prominent as other somatic and psychotic symptoms such as loss of appetite, disruptions in sleep, lack of energy or anergia, fatigue, and loss of interest and enjoyment in normal life activities.
Nearest red giant: Arcturus: 36.7 light-years (11.3 pc) Nearest supergiant: Canopus: 309 light-years (95 pc) While it is frequently described as a yellow supergiant, especially in evolutionary terms, [16] it is classified as a bright giant based on spectrum. [17] [16] List of nearest supergiants: Nearest hypergiant: μ Cephei (Herschel's Garnet ...
Mu Cephei (Latinized from μ Cephei, abbreviated Mu Cep or μ Cep), also known as Herschel's Garnet Star, Erakis, or HD 206936, is a red supergiant or hypergiant [4] [7] star in the constellation Cepheus. It appears garnet red and is located at the edge of the IC 1396 nebula.
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