NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster
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Dupree, A. K.
Dotter, Aaron
Johnson, C. I.
Marino, Anna Fabiola
Milone, Antonino P.
Bailey III, J. I.
Crane, J. D.
Mateo, Mario
Olszewski, Edward W.
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Institute of Physics Publishing Ltd.
Abstract
High-resolution spectroscopic observations were taken of 29 extended main-sequence turnoff (eMSTO) stars in the young (~200 Myr) Large Magellanic Cloud (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 Hα emission (indicative of Be-star decretion disks), others have shallow broad Hα absorption (consistent with rotation gsim150 km s−1), or deep Hα core absorption signaling lower rotation velocities (lesssim150 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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Astrophysical Journal Letters
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Restricted until
2099-12-31
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