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High-resolution spectroscopic observations were taken of 29 extended mainsequence turn-off (eMSTO) stars in the young ($\sim$200 Myr) LMC cluster, NGC1866 using the Michigan/Magellan Fiber System and MSpec spectrograph on theMagellan-Clay 6.5-m telescope. These spectra reveal the first direct detectionof rapidly rotating stars whose presence has only been inferred fromphotometric studies. The eMSTO stars exhibit H-alpha emission (indicative ofBe-star decretion disks), others have shallow broad H-alpha absorption(consistent with rotation $\gtrsim $150 km s$^{-1}$), or deep H-alpha coreabsorption signaling lower rotation velocities ($ \lesssim $150 km s$^{-1}$ ).The spectra appear consistent with two populations of stars - one rapidlyrotating, and the other, younger and slowly rotating.

NGC 1866: First Spectroscopic Detection of Fast Rotating Stars in a Young LMC Cluster