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

(2) Australian National University; (3) Leiden Observatory; (4) Observatories of the Carnegie Institution for Science; (5) University of Michigan; (6) University of Arizona); A. Dotter (1); A. F. Marino (2); A. K. Dupree (1); A. P. Milone (2); C. I. Johnson (1)

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

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arxiv 1708.03386 v1 pith:SONCQD4U submitted 2017-08-10 astro-ph.GA

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

A. K. Dupree (1) , A. Dotter (1) , C. I. Johnson (1) , A. F. Marino (2) , A. P. Milone (2) , J. I. Bailey III (3) , J. D. Crane (4) , M. Mateo (5)

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E. W. Olszewski (6) ((1) Harvard-Smithsonian Center for Astrophysics (2) Australian National University (3) Leiden Observatory (4) Observatories of the Carnegie Institution for Science (5) University of Michigan (6) University of Arizona)

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High-resolution spectroscopic observations were taken of 29 extended main sequence turn-off (eMSTO) stars in the young ($\sim$200 Myr) LMC cluster, NGC 1866 using the Michigan/Magellan Fiber System and MSpec spectrograph on the Magellan-Clay 6.5-m telescope. These spectra reveal the first direct detection of rapidly rotating stars whose presence has only been inferred from photometric studies. The eMSTO stars exhibit H-alpha emission (indicative of Be-star decretion disks), others have shallow broad H-alpha absorption (consistent with rotation $\gtrsim $150 km s$^{-1}$), or deep H-alpha core absorption signaling lower rotation velocities ($ \lesssim $150 km s$^{-1}$ ). The spectra appear consistent with two populations of stars - one rapidly rotating, and the other, younger and slowly rotating.

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