Extended main-sequence turnoffs in young massive clusters in the Magellanic Cloud

Chengyuan Li; Richard de Grijs; Licai Deng; Antonino P. Milone

Extended main-sequence turnoffs in young massive clusters in the Magellanic Cloud

Chengyuan Li^*, Richard de Grijs, Licai Deng, Antonino P. Milone

^*Corresponding author for this work

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

Abstract

The extended main-sequence turnoff region (eMSTO) shown as a common feature of young massive cluster (YMCs) in the Magellanic Clouds. Here we report the UV-optical colour-magnitude diagrams of four Large and Small Magellanic Cloud YMCs, NGC 330, NGC 1805, NGC 1818, and NGC 2164, based on high-resolution Hubble Space Telescope observations. We found that they all exhibit eMSTOs, which cannot be explained by stellar rotation alone. Adopting an age spread of 35–50 Myr can relax this diffculty. We suggest that stars in these clusters may be characterised by different ages and rotations, but the origin of the age spread remains unclear.

Original language	English
Pages (from-to)	64-68
Number of pages	5
Journal	Memorie della Società Astronomica Italiana = Journal of the Italian Astronomical Society
Volume	89
Issue number	1
Publication status	Published - 2018

Keywords

global clusters: individual: NGC 330, NGC 1805, NGC 1818, NGC 2164
Hertzsprung-Russell and C-M diagrams
Magellanic Clouds

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title = "Extended main-sequence turnoffs in young massive clusters in the Magellanic Cloud",

abstract = "The extended main-sequence turnoff region (eMSTO) shown as a common feature of young massive cluster (YMCs) in the Magellanic Clouds. Here we report the UV-optical colour-magnitude diagrams of four Large and Small Magellanic Cloud YMCs, NGC 330, NGC 1805, NGC 1818, and NGC 2164, based on high-resolution Hubble Space Telescope observations. We found that they all exhibit eMSTOs, which cannot be explained by stellar rotation alone. Adopting an age spread of 35–50 Myr can relax this diffculty. We suggest that stars in these clusters may be characterised by different ages and rotations, but the origin of the age spread remains unclear.",

keywords = "global clusters: individual: NGC 330, NGC 1805, NGC 1818, NGC 2164, Hertzsprung-Russell and C-M diagrams, Magellanic Clouds",

author = "Chengyuan Li and {de Grijs}, Richard and Licai Deng and Milone, {Antonino P.}",

year = "2018",

language = "English",

volume = "89",

pages = "64--68",

journal = "Memorie della Societ{\`a} Astronomica Italiana = Journal of the Italian Astronomical Society",

issn = "1824-016X",

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TY - JOUR

T1 - Extended main-sequence turnoffs in young massive clusters in the Magellanic Cloud

AU - Li, Chengyuan

AU - de Grijs, Richard

AU - Deng, Licai

AU - Milone, Antonino P.

PY - 2018

Y1 - 2018

N2 - The extended main-sequence turnoff region (eMSTO) shown as a common feature of young massive cluster (YMCs) in the Magellanic Clouds. Here we report the UV-optical colour-magnitude diagrams of four Large and Small Magellanic Cloud YMCs, NGC 330, NGC 1805, NGC 1818, and NGC 2164, based on high-resolution Hubble Space Telescope observations. We found that they all exhibit eMSTOs, which cannot be explained by stellar rotation alone. Adopting an age spread of 35–50 Myr can relax this diffculty. We suggest that stars in these clusters may be characterised by different ages and rotations, but the origin of the age spread remains unclear.

AB - The extended main-sequence turnoff region (eMSTO) shown as a common feature of young massive cluster (YMCs) in the Magellanic Clouds. Here we report the UV-optical colour-magnitude diagrams of four Large and Small Magellanic Cloud YMCs, NGC 330, NGC 1805, NGC 1818, and NGC 2164, based on high-resolution Hubble Space Telescope observations. We found that they all exhibit eMSTOs, which cannot be explained by stellar rotation alone. Adopting an age spread of 35–50 Myr can relax this diffculty. We suggest that stars in these clusters may be characterised by different ages and rotations, but the origin of the age spread remains unclear.

KW - global clusters: individual: NGC 330, NGC 1805, NGC 1818, NGC 2164

KW - Hertzsprung-Russell and C-M diagrams

KW - Magellanic Clouds

M3 - Article

SN - 1824-016X

VL - 89

SP - 64

EP - 68

JO - Memorie della Società Astronomica Italiana = Journal of the Italian Astronomical Society

JF - Memorie della Società Astronomica Italiana = Journal of the Italian Astronomical Society

IS - 1

ER -

Extended main-sequence turnoffs in young massive clusters in the Magellanic Cloud

Abstract

Keywords

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