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Astrophysics > Solar and Stellar Astrophysics

arXiv:2102.02352 (astro-ph)
[Submitted on 4 Feb 2021]

Title:Binary-driven stellar rotation evolution at the main-sequence turn-off in star clusters

Authors:Weijia Sun, Richard de Grijs, Licai Deng, Michael D. Albrow
View a PDF of the paper titled Binary-driven stellar rotation evolution at the main-sequence turn-off in star clusters, by Weijia Sun and 3 other authors
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Abstract:The impact of stellar rotation on the morphology of star cluster colour-magnitude diagrams is widely acknowledged. However, the physics driving the distribution of the equatorial rotation velocities of main-sequence turn-off (MSTO) stars is as yet poorly understood. Using Gaia Data Release 2 photometry and new Southern African Large Telescope medium-resolution spectroscopy, we analyse the intermediate-age ($\sim1\,$Gyr-old) Galactic open clusters NGC 3960, NGC 6134 and IC 4756 and develop a novel method to derive their stellar rotation distributions based on SYCLIST stellar rotation models. Combined with literature data for the open clusters NGC 5822 and NGC 2818, we find a tight correlation between the number ratio of slow rotators and the clusters' binary fractions. The blue-main-sequence stars in at least two of our clusters are more centrally concentrated than their red-main-sequence counterparts. The origin of the equatorial stellar rotation distribution and its evolution remains as yet unidentified. However, the observed correlation in our open cluster sample suggests a binary-driven formation mechanism.
Comments: 9 pages, 7 figures, 1 table. Accepted for publication in MNRAS
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2102.02352 [astro-ph.SR]
  (or arXiv:2102.02352v1 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.2102.02352
arXiv-issued DOI via DataCite
Related DOI: https://doi.org/10.1093/mnras/stab347
DOI(s) linking to related resources

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From: Weijia Sun [view email]
[v1] Thu, 4 Feb 2021 00:57:08 UTC (3,663 KB)
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