首页|Study of 26 Galactic Open Clusters with Extended Main-sequence Turnoffs

Study of 26 Galactic Open Clusters with Extended Main-sequence Turnoffs

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Recent studies indicate that some Galactic open clusters(OCs)exhibit extended main-sequence tumoff(eMSTO)in their color-magnitude diagrams(CMDs).However,the number of Galactic OCs with eMSTO structures detected so far is limited,and the reasons for their formation are still unclear.This work identifies 26 Galactic OCs with undiscovered eMSTOs and investigates the causes of these features.Stellar population types and fundamental parameters of cluster samples are acquired using CMD fitting methods.Among them,the results of 11 OCs are reliable as the observed CMDs are well-reproduced.We propose the crucial role of stellar binarity and confirm the importance of stellar rotation in reproducing eMSTO morphologies.The results also show that the impact of age spread is important,as it can adequately explain the structure of young OCs and fit the observed CMDs of intermediate-age OCs better.

(stars:)binaries:generalGalaxy:fundamental parameters(Galaxy:)open clusters and associations:general(stars:)Hertzsprung-Russell and C-M-diagrams

Yang-Yang Deng、Zhong-Mu Li

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Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China

University of Chinese Academy of Sciences,Beijing 100049,China

Institute of Astronomy and Information,Dali University,Dali 671003,China

PARSEC isochrone fittingYunnan Academician Workstation of Wang JingxiuChina Manned Space ProjectGuanghe projectNatural Science Foundation of Yunnan Province

202005AF150025CMS-CSST-2021-A08ghfund202302019167202201BC070003

2024

10.1088/1674-4527/ad3dc5

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(6)