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The extended main-sequence turn-off (eMSTO) is a well-known feature observed in young and intermediate-age star clusters, characterized by a significant broadening of the main-sequence turn-off region. Although prolonged star formation and…

We present Hubble Space Telescope photometry of NGC1850, a ~100 Myr, ~10^5 Msun cluster in the Large Magellanic Cloud. The colour magnitude diagram clearly shows the presence of an extended main sequence turnoff (eMSTO). The use of…

The extended main-sequence turn-offs (eMSTOs) and extended red clumps (eRCs) observed in intermediate-age star clusters challenge the traditional understanding of clusters as simple stellar populations. Recently, eMSTOs have been…

Recent studies have shown that the extended main-sequence turn off (eMSTO) is a common feature of intermediate-age star clusters in the Magellanic Clouds (MCs). The most simple explanation is that these stellar systems harbor multiple…

太阳与恒星天体物理 · 物理学 2015-05-27 A. P. Milone , L. R. Bedin , G. Piotto , A. F. Marino , S. Cassisi , A. Bellini , H. Jerjen , A. Pietrinferni , A. Aparicio , R. M. Rich

The origin of extended main-sequence turn-offs (eMSTO) in star clusters younger than 2 Gyr still challenges our current understanding of stellar evolution. Exploiting data from Gaia Data Release 3 (DR3), we investigate eMSTOs in a large…

Extended main sequence turn-off (eMSTO) regions are a common feature in color-magnitude diagrams of young and intermediate-age star clusters in the Magellanic Clouds. The nature of eMSTOs remains debated in the literature. The currently…

星系天体物理 · 物理学 2017-08-28 Paul Goudfrooij , Leo Girardi , Matteo Correnti

Recent investigations have shown that the extended main-sequence turnoffs (eMSTOs) are a common feature of intermediate-age star clusters in the Magellanic Clouds. The eMSTOs are also found in the color-magnitude diagram (CMD) of young-age…

太阳与恒星天体物理 · 物理学 2017-02-22 Wuming Yang , Zhijia Tian

There is growing evidence that star clusters can no longer be considered simple stellar populations (SSPs). Intermediate and old age clusters are often found to have extended main sequence turn-offs (eMSTOs) which are difficult to explain…

太阳与恒星天体物理 · 物理学 2019-04-10 Emma R. Beasor , Ben Davies , Nathan Smith , Nate Bastian

We present an imaging analysis of four low mass stellar clusters (< 5000 Mo) in the outer regions of the LMC in order to shed light on the extended main sequence turn-off (eMSTO) phenomenon observed in high mass clusters. The four clusters…

星系天体物理 · 物理学 2016-05-11 Andrés E. Piatti , Nate Bastian

Recent high-quality photometry of many star clusters in the Magellanic Clouds with ages of 1$\,-\,$2 Gyr revealed main sequence turnoffs (MSTOs) that are significantly wider than can be accounted for by a simple stellar population (SSP).…

太阳与恒星天体物理 · 物理学 2015-06-24 Paul Goudfrooij , Leo Girardi , Philip Rosenfield , Alessandro Bressan , Paola Marigo , Matteo Correnti , Thomas H. Puzia

We combine a number of recent studies of the extended main sequence turn-off (eMSTO) phenomenon in intermediate age stellar ($1-2$ Gyr) clusters in the Large Magellanic Cloud (LMC) in order to investigate its origin. By employing the…

星系天体物理 · 物理学 2016-08-31 Andrés E. Piatti , Nate Bastian

Extended main sequences (eMSs) and extended main-sequence turnoffs (eMSTOs) are fascinating phenomena that are routinely observed in star clusters. These phenomena strongly challenge the current canonical "simple stellar population" picture…

太阳与恒星天体物理 · 物理学 2024-01-17 Chengyuan Li , Antonino P. Milone , Weijia Sun , Richard de Grijs

We present color-magnitude diagram analysis of deep Hubble Space Telescope imaging of a mass-limited sample of 18 intermediate-age (1 - 2 Gyr old) star clusters in the Magellanic Clouds, including 8 clusters for which new data was obtained.…

The color-magnitude diagrams (CMDs) of intermediate-age star clusters (less than ~ 2 Gyr) are much more complex than those predicted by coeval, nonrotating stellar evolution models. Their observed extended main sequence turnoffs (eMSTOs)…

太阳与恒星天体物理 · 物理学 2022-08-03 Mikhail Lipatov , Timothy D. Brandt , Seth Gossage

The extended main sequence turn offs (eMSTOs) of several young to intermediate age clusters are examined in the Magellanic Clouds and the Milky Way. We explore the effects of extended star formation (eSF) and a range of stellar rotation…

Recent observations of intermediate age (1 - 3 Gyr) massive star clusters in the Large Magellanic Cloud (LMC) have revealed that the majority possess bifurcated or extended main-sequence turn-off (EMSTO) morphologies. This effect can be…

星系天体物理 · 物理学 2015-05-27 Stefan C. Keller , A. Dougal Mackey , Gary S. Da Costa

The extended main sequence (eMS) and extended main sequence turnoff (eMSTO) phenomena have been observed in some young and intermediate-age star clusters in the Milky Way and in the Magellanic Clouds. In this study, we conduct a survey of…

星系天体物理 · 物理学 2026-04-07 Khushboo K Rao , Wen-Ping Chen

The origin of extended main sequence turnoffs (eMSTOs) in intermediate-age (1-3 Gyr) clusters is one of the most intriguing questions in current star cluster research. Unlike the split main sequences found in some globular clusters. which…

太阳与恒星天体物理 · 物理学 2019-05-15 Weijia Sun , Richard de Grijs , Licai Deng , Michael D. Albrow

Extended main sequence turn-offs (eMSTOs) are a common feature in color-magnitude diagrams (CMDs) of young and intermediate-age star clusters in the Magellanic Clouds. The nature of eMSTOs is still debated. The most popular scenarios are…

太阳与恒星天体物理 · 物理学 2018-08-27 Paul Goudfrooij , Leo Girardi , Andrea Bellini , Alessandro Bressan , Matteo Correnti , Guglielmo Costa

Over the past decade, stellar rotation has emerged as a key factor in shaping the morphology of color-magnitude diagrams of young and intermediate-age star clusters. In this study, we use MUSE integral-field spectroscopy to investigate the…

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