Fig. A.1
Bolometric magnitude vs. pulsation period for the O-rich stars. Stars without periods are plotted as plus signs at negative periods. The solid line indicates the lower luminosity limit for RSGs by WBF, and the dashed line is 1.8 mag brighter. Top panel: the legend indicates the meaning of the symbols in terms of the I-band semi-amplitudes (A), and [3.6]−[8.0] colours. Bottom panel: as top panel, but the objects are identified as foreground objects (open circles), RSG (filled triangles), and AGB stars (open squares).
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