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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 H α emission (indicative of Be-star decretion disks), others have shallow broad H α absorption (consistent with rotation ≳150 km s{sup −1}), or deep H α core absorption signaling lower rotation velocities (≲150 km s{sup −1}). The spectra appear consistent with two populations of stars—one rapidly rotating, and the other, younger and slowly rotating.

Authors:
; ;  [1]; ;  [2];  [3];  [4];  [5];  [6]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  2. Australian National University, The Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Weston Creek, ACT 2611 (Australia)
  3. Leiden Observatory, Niels Bohrweg 2, NL-2333 CA Leiden (Netherlands)
  4. The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)
  5. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States)
  6. The University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85721 (United States)
Publication Date:
OSTI Identifier:
22654402
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 846; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; DETECTION; EMISSION; FIBERS; MAGELLANIC CLOUDS; RESOLUTION; ROTATION; SPECTRA; STARS; TELESCOPES; VELOCITY

Citation Formats

Dupree, A. K., Dotter, A., Johnson, C. I., Marino, A. F., Milone, A. P., Bailey, J. I. III, Crane, J. D., Mateo, M., and Olszewski, E. W. NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA85DD.
Dupree, A. K., Dotter, A., Johnson, C. I., Marino, A. F., Milone, A. P., Bailey, J. I. III, Crane, J. D., Mateo, M., & Olszewski, E. W. NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster. United States. doi:10.3847/2041-8213/AA85DD.
Dupree, A. K., Dotter, A., Johnson, C. I., Marino, A. F., Milone, A. P., Bailey, J. I. III, Crane, J. D., Mateo, M., and Olszewski, E. W. Fri . "NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster". United States. doi:10.3847/2041-8213/AA85DD.
@article{osti_22654402,
title = {NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster},
author = {Dupree, A. K. and Dotter, A. and Johnson, C. I. and Marino, A. F. and Milone, A. P. and Bailey, J. I. III and Crane, J. D. and Mateo, M. and Olszewski, E. W.},
abstractNote = {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 H α emission (indicative of Be-star decretion disks), others have shallow broad H α absorption (consistent with rotation ≳150 km s{sup −1}), or deep H α core absorption signaling lower rotation velocities (≲150 km s{sup −1}). The spectra appear consistent with two populations of stars—one rapidly rotating, and the other, younger and slowly rotating.},
doi = {10.3847/2041-8213/AA85DD},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 846,
place = {United States},
year = {2017},
month = {9}
}