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Yellow supergiants generally have spectral types of F and G, although sometimes late A or early K stars are included. [1] [2] [3] These spectral types are characterised by hydrogen lines that are very strong in class A, weakening through F and G until they are very weak or absent in class K. Calcium H and K lines are present in late A spectra, but stronger in class F, and strongest in class G ...
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 ...
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.
The primary component of the φ Cassiopeiae system is a very luminous yellow supergiant. Its absolute magnitude is comparable to some yellow hypergiants but it does not show the level of mass loss and instability that would qualify it as a hypergiant itself.
RW Cephei has been classified as a semi-regular variable star of type SRd, meaning that it is a slowly varying yellow giant or supergiant. The General Catalogue of Variable Stars cites a 1952 study giving a period of approximately 346 days, [ 35 ] [ 5 ] while other studies suggest different periods and certainly no strong periodicity.
A yellow supergiant. HD 268757 979 [113] Large Magellanic Cloud L/T eff: A G8 yellow hypergiant. SMC 56389 976 [105] Small Magellanic Cloud L/T eff: LMC 136404 974 [105] Large Magellanic Cloud L/T eff: SP77 46-32 973 [105] –1,133 [107] Large Magellanic Cloud HV 2084 967 [105] –1,083 [107] Small Magellanic Cloud WOH S74 965 [105] –1,014 ...
Type I Cepheid variables, more luminous still and mostly supergiants, with even longer periods; Delta Scuti variables, includes subgiant and main-sequence stars. Yellow giants may be moderate-mass stars evolving for the first time towards the red-giant branch, or they may be more evolved stars on the horizontal branch.
R Coronae Borealis is a low-mass yellow supergiant star in the constellation of Corona Borealis.It is the prototype of the R Coronae Borealis variable of variable stars, which fade by several magnitudes at irregular intervals.