Blue straggler stars beyond the milky way. IV. Radial distributions and dynamical implications

Chengyuan Li; Weijia Sun; Jongsuk Hong; Licai Deng; Richard De Grijs; Alison Sills

doi:10.3847/1538-4357/aaf9b3

Blue straggler stars beyond the milky way. IV. Radial distributions and dynamical implications

Chengyuan Li, Weijia Sun, Jongsuk Hong, Licai Deng, Richard De Grijs, Alison Sills

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Abstract

Blue straggler stars (BSSs) have been proposed as powerful indicators to measure the dynamical state of Galactic globular clusters (GCs). Here we examine for the first time whether this framework of BSSs as dynamical clocks, which was specifically developed for Galactic GCs, may also hold for younger GCs in the Large Magellanic Cloud (LMC). Using Hubble Space Telescope observations, we study seven LMC star clusters with ages between ∼700 Myr and 7 Gyr. We confirm that our sample clusters are consistent with the empirical correlation previously derived for Galactic GCs, within a modest tolerance. We suggest that to further examine whether BSSs can measure the dynamical state of their host clusters over an extended range of dynamical ages, more studies of dynamically older Magellanic Cloud clusters are required. We discuss the physical implications of our results in terms of their central, dimensionless King potential, as well as the initial retention fraction of black holes.

Original language	English
Article number	171
Pages (from-to)	1-14
Number of pages	14
Journal	Astrophysical Journal
Volume	871
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aaf9b3
Publication status	Published - 1 Feb 2019

Bibliographical note

Copyright 2019 The American Astronomical Society. First published in the Astrophysical Journal, 871(2), 171, 2019, published by IOP Publishing. The original publication is available at http://www.doi.org/10.3847/1538-4357/aaf9b3. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

blue stragglers
galaxies: Star clusters: General

Access to Document

10.3847/1538-4357/aaf9b3

Publisher version (open access)Final published version, 6.32 MBLicence: Other

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title = "Blue straggler stars beyond the milky way. IV. Radial distributions and dynamical implications",

abstract = "Blue straggler stars (BSSs) have been proposed as powerful indicators to measure the dynamical state of Galactic globular clusters (GCs). Here we examine for the first time whether this framework of BSSs as dynamical clocks, which was specifically developed for Galactic GCs, may also hold for younger GCs in the Large Magellanic Cloud (LMC). Using Hubble Space Telescope observations, we study seven LMC star clusters with ages between ∼700 Myr and 7 Gyr. We confirm that our sample clusters are consistent with the empirical correlation previously derived for Galactic GCs, within a modest tolerance. We suggest that to further examine whether BSSs can measure the dynamical state of their host clusters over an extended range of dynamical ages, more studies of dynamically older Magellanic Cloud clusters are required. We discuss the physical implications of our results in terms of their central, dimensionless King potential, as well as the initial retention fraction of black holes.",

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AU - Li, Chengyuan

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AU - Grijs, Richard De

AU - Sills, Alison

N1 - Copyright 2019 The American Astronomical Society. First published in the Astrophysical Journal, 871(2), 171, 2019, published by IOP Publishing. The original publication is available at http://www.doi.org/10.3847/1538-4357/aaf9b3. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - Blue straggler stars (BSSs) have been proposed as powerful indicators to measure the dynamical state of Galactic globular clusters (GCs). Here we examine for the first time whether this framework of BSSs as dynamical clocks, which was specifically developed for Galactic GCs, may also hold for younger GCs in the Large Magellanic Cloud (LMC). Using Hubble Space Telescope observations, we study seven LMC star clusters with ages between ∼700 Myr and 7 Gyr. We confirm that our sample clusters are consistent with the empirical correlation previously derived for Galactic GCs, within a modest tolerance. We suggest that to further examine whether BSSs can measure the dynamical state of their host clusters over an extended range of dynamical ages, more studies of dynamically older Magellanic Cloud clusters are required. We discuss the physical implications of our results in terms of their central, dimensionless King potential, as well as the initial retention fraction of black holes.

AB - Blue straggler stars (BSSs) have been proposed as powerful indicators to measure the dynamical state of Galactic globular clusters (GCs). Here we examine for the first time whether this framework of BSSs as dynamical clocks, which was specifically developed for Galactic GCs, may also hold for younger GCs in the Large Magellanic Cloud (LMC). Using Hubble Space Telescope observations, we study seven LMC star clusters with ages between ∼700 Myr and 7 Gyr. We confirm that our sample clusters are consistent with the empirical correlation previously derived for Galactic GCs, within a modest tolerance. We suggest that to further examine whether BSSs can measure the dynamical state of their host clusters over an extended range of dynamical ages, more studies of dynamically older Magellanic Cloud clusters are required. We discuss the physical implications of our results in terms of their central, dimensionless King potential, as well as the initial retention fraction of black holes.

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Blue straggler stars beyond the milky way. IV. Radial distributions and dynamical implications

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