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dc.contributor.authorXiang, Yue
dc.contributor.authorGu, Shenghong
dc.contributor.authorCameron, A. Collier
dc.contributor.authorBarnes, J. R.
dc.contributor.authorChristensen-Dalsgaard, J.
dc.contributor.authorGrundahl, F.
dc.contributor.authorAntoci, V.
dc.contributor.authorAndersen, M. F.
dc.contributor.authorPallé, P. L.
dc.identifier.citationXiang , Y , Gu , S , Cameron , A C , Barnes , J R , Christensen-Dalsgaard , J , Grundahl , F , Antoci , V , Andersen , M F & Pallé , P L 2020 , ' Doppler imaging and differential rotation of σ 2 Coronae Borealis using SONG ' , Astrophysical Journal , vol. 893 , no. 2 , 164 .
dc.identifier.otherPURE: 268007866
dc.identifier.otherPURE UUID: 4e66a76d-e621-49a2-a97e-fcfe2b7e33da
dc.identifier.otherORCID: /0000-0002-8863-7828/work/74510006
dc.identifier.otherWOS: 000531250500001
dc.identifier.otherScopus: 85085075718
dc.descriptionThis work is supported by National Natural Science Foundation of China (grant Nos. 10373023, 10773027, 11333006, 11603068, and U1531121) and Chinese Academy of Sciences project (No. KJCX2-YW-T24). Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant DNRF106).en
dc.description.abstractWe present new Doppler images of both components of the double-lined binary σ 2 CrB, based on the high-resolution spectroscopic data collected during 11 nights in 2015 March–April. The observed spectra form two independent data sets with sufficient phase coverage. We apply the least-squares deconvolution to all observed spectra to obtain high signal-to-noise mean profiles, from which we derive the Doppler images of both components of σ 2 CrB simultaneously. The surfaces of both F9 and G0 components are dominated by pronounced polar spots. The F9 component exhibits a weak spot at latitude 30° and its mid-to-low latitudes are relatively featureless. The G0 star shows an extended spot structure at latitude 30°, and its surface spot coverage is larger than that of the F9 star, which suggests a higher level of magnetic activity. With the cross-correlation method, we derive a solar-like surface differential rotation on the G0 star of σ 2 CrB for the first time, and the surface shear rate is ΔΩ = 0.180 ± 0.004 rad days−1 and α = ΔΩ/Ωeq = 0.032 ± 0.001. We do not obtain a clear surface shear law for the F9 star due to the lack of mid-to-low latitude features, but detect a systematic longitude shift of high-latitude spots, which indicates a slower rotation with respect to the corotating frame.
dc.relation.ispartofAstrophysical Journalen
dc.rightsCopyright © 2020. The American Astronomical Society. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectStellar activity (1580)en
dc.subjectClose binary stars (254)en
dc.subjectDoppler imaging (400)en
dc.subjectStarspots (1572)en
dc.subjectQB Astronomyen
dc.titleDoppler imaging and differential rotation of σ 2 Coronae Borealis using SONGen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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