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 journalArticlepeer-review


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 languageEnglish
Pages (from-to)64-68
Number of pages5
JournalMemorie della Società Astronomica Italiana = Journal of the Italian Astronomical Society
Issue number1
Publication statusPublished - 2018


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


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