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; E. W. Olszewski

doi:10.3847/2041-8213/aa85dd

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
, E. W. Olszewski

Astronomy

Research output: Contribution to journal › Article › peer-review

71 Scopus citations

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 language	English (US)
Article number	L1
Journal	Astrophysical Journal Letters
Volume	846
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/aa85dd
State	Published - Sep 1 2017

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

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10.3847/2041-8213/aa85dd

Cite this

@article{a4fc47c50a2e422b8022868f335c83dc,

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

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.",

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

author = "Dupree, \{A. K.\} and A. Dotter and Johnson, \{C. I.\} and Marino, \{A. F.\} and Milone, \{A. P.\} and Bailey, \{J. I.\} and Crane, \{J. D.\} and M. Mateo and Olszewski, \{E. W.\}",

note = "Funding Information: We thank the anonymous referee for thoughtful comments and advice on the manuscript. A.F.M. and A.P.M. acknowledge support by the Australian Research Council through Discovery Early Career Researcher Awards DE160100851 and DE150101816. E.W.O. was partially supported by NSF grant AST1313006. This research has made use of NASA{\textquoteright}s Astrophysics Data System Bibliographic Services. And we have used data products from 2MASS, which is a joint project of the University of Massachusetts and IPAC/Caltech, funded by NASA and the NSF. Facility: Magellan: Clay (M2FS). Publisher Copyright: {\textcopyright} 2017. The American Astronomical Society. All rights reserved..",

year = "2017",

month = sep,

day = "1",

doi = "10.3847/2041-8213/aa85dd",

language = "English (US)",

volume = "846",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - NGC 1866

T2 - First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster

AU - Dupree, A. K.

AU - Dotter, A.

AU - Johnson, C. I.

AU - Marino, A. F.

AU - Milone, A. P.

AU - Bailey, J. I.

AU - Crane, J. D.

AU - Mateo, M.

AU - Olszewski, E. W.

N1 - Funding Information: We thank the anonymous referee for thoughtful comments and advice on the manuscript. A.F.M. and A.P.M. acknowledge support by the Australian Research Council through Discovery Early Career Researcher Awards DE160100851 and DE150101816. E.W.O. was partially supported by NSF grant AST1313006. This research has made use of NASA’s Astrophysics Data System Bibliographic Services. And we have used data products from 2MASS, which is a joint project of the University of Massachusetts and IPAC/Caltech, funded by NASA and the NSF. Facility: Magellan: Clay (M2FS). Publisher Copyright: © 2017. The American Astronomical Society. All rights reserved..

PY - 2017/9/1

Y1 - 2017/9/1

N2 - 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.

AB - 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.

KW - globular clusters: individual (NGC 1866)

KW - stars: emission-line, Be

KW - stars: rotation

KW - techniques:spectroscopic

UR - https://www.scopus.com/pages/publications/85028923164

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DO - 10.3847/2041-8213/aa85dd

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AN - SCOPUS:85028923164

SN - 2041-8205

VL - 846

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L1

ER -

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

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Keywords

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