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

A. K. Dupree, A. Dotter, C. I. Johnson, A. F. Marino, A. P. Milone, J. I. Bailey, J. D. Crane, M. Mateo, Edward W Olszewski

Research output: Contribution to journalArticle

14 Citations (Scopus)

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 150 km s-1), or deep Hα core absorption signaling lower rotation velocities (≲150 km s-1). The spectra appear consistent with two populations of stars - one rapidly rotating, and the other, younger and slowly rotating.

Original languageEnglish (US)
Article numberL1
JournalAstrophysical Journal Letters
Volume846
Issue number1
DOIs
StatePublished - Sep 1 2017

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Magellanic clouds
stars
main sequence stars
clay
clays
spectrographs
detection
young
telescopes
fibers
high resolution
fibre

Keywords

  • globular clusters: individual (NGC 1866)
  • stars: emission-line, Be
  • stars: rotation
  • techniques:spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

NGC 1866 : First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster. / Dupree, A. K.; Dotter, A.; Johnson, C. I.; Marino, A. F.; Milone, A. P.; Bailey, J. I.; Crane, J. D.; Mateo, M.; Olszewski, Edward W.

In: Astrophysical Journal Letters, Vol. 846, No. 1, L1, 01.09.2017.

Research output: Contribution to journalArticle

Dupree, AK, Dotter, A, Johnson, CI, Marino, AF, Milone, AP, Bailey, JI, Crane, JD, Mateo, M & Olszewski, EW 2017, 'NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster', Astrophysical Journal Letters, vol. 846, no. 1, L1. https://doi.org/10.3847/2041-8213/aa85dd
Dupree, A. K. ; Dotter, A. ; Johnson, C. I. ; Marino, A. F. ; Milone, A. P. ; Bailey, J. I. ; Crane, J. D. ; Mateo, M. ; Olszewski, Edward W. / NGC 1866 : First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster. In: Astrophysical Journal Letters. 2017 ; Vol. 846, No. 1.
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AU - Marino, A. F.

AU - Milone, A. P.

AU - Bailey, J. I.

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