Investigation of the pulsations, outbursts, and evolution of the yellow hypergiants - ρ Cas, HR 8752, and HR 5171A, with notes on HD 179821

Open Access

Fig. 4.

HRD for ρ Cas in 1962–2020. The encircled area in the HRD, having a central T_eff = 6700 K ± 700 K and a luminosity of 5.42, locates the blue dots showing zig-zaging changes in the observed median (B − V)_obs of Fig. 1.

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