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Where did the eMSTO go?

3 Jan 2019, 18:00 UTC
Where did the eMSTO go?
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Title: Disappearance of the extended main sequence turn-off in intermediate age clusters as a consequence of magnetic brakingAuthors: C. Georgy, C. Charbonnel, L. Amard, N. Bastian, S. Ekström, C. Lardo, A. Palacios, P. Eggenberger, I. Cabrera-Ziri, F. Gallet, N. LagardeFirst Author’s Institution: Department of Astronomy, University of Geneva, Versoix, SwitzerlandStatus: Accepted for publication in A&A [open access on arXiv]In a previous astrobite, I wrote about the curious phenomenon of extended main sequence turn-off (eMSTO) seen in young and intermediate age stellar clusters. The eMSTO is a feature in the color-magnitude diagram (CMD) of these clusters where the main sequence turn-off looks unusual – far more spread out than it should be for a normal set of stars with the same age. One possible reason for this phenomenon is stellar rotation and the findings I discussed last time supported that explanation.In today’s bite, we will follow the thread even further. The main idea is this: if rotation causes the eMSTO feature, then removing it should make the feature disappear. That is why the authors of today’s paper investigate magnetic braking, which slows down rotating stars. Using many sets of rotating stellar models, they predict the cluster age when we should no ...

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