Hertzsprung-Russell diagram (HRD) showing the location of each of our target stars. The start of the main sequence is indicated by the solid line, with specific initial masses from the evolutionary models of Ekström et al. (2012). Filled (open) symbols are stars with definite (absent or uncertain) CO band head emission. Based on the object types in Table 1, circles are B[e]SGs, diamonds represent LBVs, triangles show YHGs, and the square is the Peculiar Oe star. Dashed lines between symbols indicate LBV variable parameters. Also plotted is the Humphreys-Davidson limit (dotted line, Humphreys & Davidson 1994).
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