NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster
AuthorDupree, A. K.
Johnson, C. I.
Marino, A. F.
Milone, A. P.
Bailey, J. I.
Crane, J. D.
Olszewski, E. W.
Keywordsglobular clusters: individual (NGC 1866)
stars: emission-line, Be
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationNGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster 2017, 846 (1):L1 The Astrophysical Journal
Rights© 2017. The American Astronomical Society. All rights reserved.
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AbstractHigh-resolution spectroscopic observations were taken of 29 extended main-sequence turnoff (eMSTO) stars in the young (similar to 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 Ha emission (indicative of Be-star decretion disks), others have shallow broad H alpha absorption (consistent with rotation. greater than or similar to 150 km s(-1)), or deep Ha core absorption signaling lower rotation velocities (less than or similar to 150 km s(-1)). The spectra appear consistent with two populations of stars-one rapidly rotating, and the other, younger and slowly rotating.
VersionFinal published version
SponsorsAustralian Research Council through Discovery Early Career Researcher Awards [DE160100851, DE150101816]; NSF [AST1313006]; NASA; NSF