Position of the sample of stars in the HR diagram. Evolutionary tracks (taken from Ekström et al. 2012, black solid lines) correspond to non-rotating stars with M⋆ = 12, 15, 20, 32, 40, and 60 M⊙. The coloured curves define instability boundaries of various modes (Saio 2011): a) stability boundary for low-order radial and non-radial p modes (blue solid line); b) non-radial g modes with l = 1 and 2 (red short-dashed and solid lines, respectively); c) oscillatory convection modes (cyan dot-dashed lines); d) monotonically unstable radial modes (above the magenta dotted-line, where the hypergiant star HD 80077 is found). The blue, green, red, and magenta diamonds correspond to early (E), mid (M), and late (L) BSGs, and 55 Cyg, respectively.
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