Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 846, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aa85dd
Keywords
globular clusters: individual (NGC 1866); stars: emission-line, Be; stars: rotation; techniques: spectroscopic
Categories
Funding
- Australian Research Council through Discovery Early Career Researcher Awards [DE160100851, DE150101816]
- NSF [AST1313006]
- NASA
- NSF
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1313006] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1312997] Funding Source: National Science Foundation
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High-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.
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