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

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dc.contributor.authorSun W
dc.contributor.authorGrijs RD
dc.contributor.authorDeng L
dc.contributor.authorAlbrow, Michael
dc.date.accessioned2021-06-30T04:45:28Z
dc.date.available2021-06-30T04:45:28Z
dc.date.issued2021en
dc.date.updated2021-06-17T03:01:08Z
dc.description.abstractThe 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.en
dc.identifier.citationSun W, Grijs RD, Deng L, Albrow MD (2021). Binary-driven stellar rotation evolution at the main-sequence turn-off in star clusters. Monthly Notices of the Royal Astronomical Society. 502(3). 4350-4358.en
dc.identifier.doihttp://doi.org/10.1093/mnras/stab347
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.urihttps://hdl.handle.net/10092/102137
dc.languageen
dc.language.isoen
dc.publisherOxford University Press (OUP)en
dc.rightsAll rights reserved unless otherwise stateden
dc.rights.urihttp://hdl.handle.net/10092/17651en
dc.subjectastro-ph.SRen
dc.subjectastro-ph.SRen
dc.subjectastro-ph.GAen
dc.subjectgalaxiesen
dc.subjectstar clustersen
dc.subjectgeneral – techniquesen
dc.subjectspectroscopicen
dc.subject.anzsrc0201 Astronomical and Space Sciencesen
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systemsen
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510104 - Galactic astronomyen
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510102 - Astronomical instrumentationen
dc.titleBinary-driven stellar rotation evolution at the main-sequence turn-off in star clustersen
dc.typeJournal Articleen
uc.collegeFaculty of Science
uc.departmentSchool of Physical & Chemical Sciences
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