Fig. 13.
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Luminosity versus MLR diagrams for the final RSG sample. Targets are color-coded with τ, while targets with very large τ (>1.0) are marked by the open circles in the diagram. The dashed line indicates the luminosity of log10(L/L⊙) = 4.6. We note that the low-luminosity targets (log10(L/L⊙)≲4.0) may not be true RSGs, but ∼6 − 8 M⊙ red helium-burning stars.
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