Spectral Classification controversy
The stellar classification has been classified as early as G8 and as late as M2, but it is not clear yet that there has been actual variation of the star. In the first Morgan-Keenan spectral atlas, RW Cephei's stellar classification was counted as M0:Ia. RW Cep was later listed as the standard star for spectral type G8 Ia, then as the standard for K0 0-Ia.
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