Fig. A.1
The color-excess ratio of HR 8752, recalculated for synchronicity of MK-type, is given as function of 1/λ, with the plot for the mean of 6 stars in Cepheus from Johnson (1968) as comparison, leading to an redetermination of the R-ratio R. We estimate for HR 8752 an R = 4.4 with an accuracy of + −0.2 in analogy with Johnson’s determination of the the R-value at 1/λ = 0 for the “mean”. With E(B − V) = 0.70 the absorption in the V color is Av = 3.08.
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