MV versus V–I color–magnitude diagram of the brightest SH 2-266 cluster stars derived from the MUSE data. Black squares are B- and A-type stars, and red squares are cooler F- and G-type stars, corrected for their individual extinction. The arrow at MWC 137 indicates the positions in the color–magnitude diagram from the average inner cluster estimate of E(B–V) = 1.2 mag to the estimate for MWC 137 of E(B–V) ~ 1.8 mag. The open gray squares are unclassified stars corrected for a standard extinction of E(B–V) = 1.2 mag. Theoretical stellar evolution isochrones for 1 Myr, 10 Myr, and 15 Myr (gray dashed curves) and the evolutionary paths for 10 M⊙, 15 M⊙, and 20 M⊙ stars from the Geneva stellar models are shown (Ekström et al. 2012; Yusof et al. 2013). 1 Myr and 10 Myr pre-main sequence theoretical isochrones for star masses of 0.1–7 M⊙ from Siess et al. (2000) are also shown (gray dotted curve).
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