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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.date.accessioned2020-05-25T14:30:02Z
dc.date.available2020-05-25T14:30:02Z
dc.date.issued2020-04-28
dc.identifier268007866
dc.identifier4e66a76d-e621-49a2-a97e-fcfe2b7e33da
dc.identifier000531250500001
dc.identifier85085075718
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 . https://doi.org/10.3847/1538-4357/ab8229en
dc.identifier.issn0004-637X
dc.identifier.otherArXiv: http://arxiv.org/abs/2005.02592v1
dc.identifier.otherORCID: /0000-0002-8863-7828/work/74510006
dc.identifier.urihttps://hdl.handle.net/10023/19988
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.format.extent672267
dc.language.isoeng
dc.relation.ispartofAstrophysical Journalen
dc.subjectStellar activity (1580)en
dc.subjectClose binary stars (254)en
dc.subjectDoppler imaging (400)en
dc.subjectStarspots (1572)en
dc.subjectQB Astronomyen
dc.subject3rd-DASen
dc.subject.lccQBen
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.identifier.doi10.3847/1538-4357/ab8229
dc.description.statusPeer revieweden
dc.date.embargoedUntil2020-04-28


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