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FIRST OBSERVATIONAL SIGNATURE OF ROTATIONAL DECELERATION IN A MASSIVE, INTERMEDIATE-AGE STAR CLUSTER IN THE MAGELLANIC CLOUDS
Wu, Xiaohan; Li, Chengyuan; de Grijs, Richard; Deng, Licai
2016
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume826Issue:1
AbstractWhile the extended main-sequence turnoffs (eMSTOs) found in almost all 1-2 Gyr old star clusters in the Magellanic Clouds are often explained by postulating extended star formation histories (SFHs), the tight subgiant branches (SGBs) seen in some clusters challenge this popular scenario. Puzzlingly, the SGB of the eMSTO cluster NGC 419 is significantly broader at bluer than at redder colors. We carefully assess and confirm the reality of this observational trend. If we would assume that the widths of the features in color magnitude space were entirely owing to a range in stellar ages, the SFHs of the eMSTO stars and the blue SGB region would be significantly more prolonged than that of the red part of the SGB. This cannot be explained by assuming an internal age spread. We show that rotational deceleration of a population of rapidly rotating stars, a currently hotly debated alternative scenario, naturally explains the observed trend along the SGB. Our analysis shows that a "converging" SGB could be produced if the cluster is mostly composed of rapidly rotating stars that slow down over time owing to the conservation of angular momentum during their evolutionary expansion from main-sequence turnoff stars to red giants.
DOI10.3847/2041-8205/826/1/L14
WOS IDIOP:2041-8205-826-1-L14
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16843
Collection恒星结构、演化和脉动研究团组
Recommended Citation
GB/T 7714
Wu, Xiaohan,Li, Chengyuan,de Grijs, Richard,et al. FIRST OBSERVATIONAL SIGNATURE OF ROTATIONAL DECELERATION IN A MASSIVE, INTERMEDIATE-AGE STAR CLUSTER IN THE MAGELLANIC CLOUDS[J]. ASTROPHYSICAL JOURNAL LETTERS,2016,826(1).
APA Wu, Xiaohan,Li, Chengyuan,de Grijs, Richard,&Deng, Licai.(2016).FIRST OBSERVATIONAL SIGNATURE OF ROTATIONAL DECELERATION IN A MASSIVE, INTERMEDIATE-AGE STAR CLUSTER IN THE MAGELLANIC CLOUDS.ASTROPHYSICAL JOURNAL LETTERS,826(1).
MLA Wu, Xiaohan,et al."FIRST OBSERVATIONAL SIGNATURE OF ROTATIONAL DECELERATION IN A MASSIVE, INTERMEDIATE-AGE STAR CLUSTER IN THE MAGELLANIC CLOUDS".ASTROPHYSICAL JOURNAL LETTERS 826.1(2016).
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