HR diagram showing the locations of 5 RSGs in the cluster, with their positions derived from the spectral classification, assuming a distance to the cluster d = 4.0 kpc. We also plot isochrones from Meynet & Maeder (2000). The solid lines are the log t = 7.10 (13 Myr; top, red), and log t = 7.20 (16 Myr; bottom, blue) isochrones with high initial rotation. The dotted lines are the log t = 7.10 (13 Myr; magenta), and log t = 7.20 (16 Myr; green) isochrones without rotation. The size of the symbols represents the errors in log L∗ that are due to observational uncertainties and calibration problems. The errors in Teff, though difficult to quantify, should be smaller than the symbol size.
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