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

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

67 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 language	English
Article number	L1
Journal	Astrophysical Journal Letters
Volume	846
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/aa85dd
Publication status	Published - 1 Sept 2017

Access to Document

10.3847/2041-8213/aa85dd

Cite this

@article{b055159b54444a03a3604eaa8243b2b7,

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.}",

year = "2017",

month = sep,

day = "1",

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

language = "English",

volume = "846",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "1",

}

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.

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 - http://www.scopus.com/inward/record.url?scp=85028923164&partnerID=8YFLogxK

U2 - 10.3847/2041-8213/aa85dd

DO - 10.3847/2041-8213/aa85dd

M3 - Article

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this