Hertzsprung-Russell diagram showing the location of each target star with detected CO emission. The evolutionary tracks from Meynet & Maeder (2005) (LMC, SMC) and Ekström et al. (2012) (Milky Way) trace the change in 12C/13C ratio with stellar evolution. For the Galaxy, the tracks are computed for an Ω = 0.4, while the Magellanic Cloud tracks are for νeq = 300 km s-1. Ω is the ratio of the rotational velocity to the critical rotation rate and νeq is the equatorial rotational velocity. The symbols are explained in the caption of Fig. 8.
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