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Astrophysics > Solar and Stellar Astrophysics
Title: Study of 26 Galactic open clusters with extended main-sequence turnoffs
(Submitted on 27 Mar 2024 (v1), last revised 10 Apr 2024 (this version, v2))
Abstract: Recent studies indicate that some Galactic open clusters (OCs) exhibit extended main-sequence turnoff (eMSTO) in their colour-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.
Submission history
From: Yangyang Deng [view email][v1] Wed, 27 Mar 2024 03:42:10 GMT (200kb,D)
[v2] Wed, 10 Apr 2024 09:17:27 GMT (207kb,D)
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