Radial coordinate and surface temperature as a function of time for a 10 M⊙ pulsating stellar model. The black thick line is the surface of the stellar model and the green striped region shows the layers unstable to convection during a pulsation cycle. The blue dot-dashed line tracks the location as a function of time of the temperature at which the iron opacity peak is maximum in a static configuration, i.e. log (T/ K) ≈ 5.3 (see also Fig. 2).
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