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dc.contributor.authorCotton, Daniel V.
dc.contributor.authorBailey, Jeremy A.
dc.contributor.authorHowarth, Ian D.
dc.contributor.authorBott, Kimberly
dc.contributor.authorKedziora-Chudczer, Lucyna
dc.contributor.authorLucas, P. W.
dc.contributor.authorHough, J. H.
dc.date.accessioned2018-08-17T14:52:26Z
dc.date.available2018-08-17T14:52:26Z
dc.date.issued2017-09-18
dc.identifier.citationCotton , D V , Bailey , J A , Howarth , I D , Bott , K , Kedziora-Chudczer , L , Lucas , P W & Hough , J H 2017 , ' Polarization due to rotational distortion in the bright star Regulus ' , Nature Astronomy , vol. 1 . https://doi.org/10.1038/s41550-017-0238-6
dc.identifier.issn2397-3366
dc.identifier.otherPURE: 15173724
dc.identifier.otherPURE UUID: 195b3917-4ca1-4583-8d88-afeae2de2f60
dc.identifier.otherArXiv: http://arxiv.org/abs/1804.06576v1
dc.identifier.otherScopus: 85037119274
dc.identifier.otherORCID: /0000-0002-8872-4462/work/62748845
dc.identifier.urihttp://hdl.handle.net/2299/20473
dc.descriptionThis is the full published article (retrieved from the 6 months post-publication posting on arXiv) including the Methods and Supplementary Information sections: 33 pages, 10 figures, 8 tables
dc.description.abstractPolarization in stars was first predicted by Chandrasekhar [1] who calculated a substantial linear polarization at the stellar limb for a pure electron-scattering atmosphere. This polarization will average to zero when integrated over a spherical star but could be detected if the symmetry is broken, for example by the eclipse of a binary companion. Nearly 50 years ago, Harrington and Collins [2] modeled another way of breaking the symmetry and producing net polarization - the distortion of a rapidly rotating hot star. Here we report the first detection of this effect. Observations of the linear polarization of Regulus, with two different high-precision polarimeters, range from +42 parts-per-million (ppm) at a wavelength of 741 nm to -22 ppm at 395 nm. The reversal from red to blue is a distinctive feature of rotation-induced polarization. Using a new set of models for the polarization of rapidly rotating stars we find that Regulus is rotating at 96.5(+0.6/-0.8)% of its critical angular velocity for breakup, and has an inclination greater than 76.5 degrees. The rotation axis of the star is at a position angle of 79.5+/-0.7 degrees. The conclusions are independent of, but in good agreement with, the results of previously published interferometric observations of Regulus [3]. The accurate measurement of rotation in early-type stars is important for understanding their stellar environments [4], and course of their evolution [5].en
dc.format.extent33
dc.language.isoeng
dc.relation.ispartofNature Astronomy
dc.subjectastro-ph.SR
dc.titlePolarization due to rotational distortion in the bright star Regulusen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1038/s41550-017-0238-6
rioxxterms.typeJournal Article/Review


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