Files in this item
Doppler imaging and differential rotation of σ 2 Coronae Borealis using SONG
Item metadata
dc.contributor.author | Xiang, Yue | |
dc.contributor.author | Gu, Shenghong | |
dc.contributor.author | Cameron, A. Collier | |
dc.contributor.author | Barnes, J. R. | |
dc.contributor.author | Christensen-Dalsgaard, J. | |
dc.contributor.author | Grundahl, F. | |
dc.contributor.author | Antoci, V. | |
dc.contributor.author | Andersen, M. F. | |
dc.contributor.author | Pallé, P. L. | |
dc.date.accessioned | 2020-05-25T14:30:02Z | |
dc.date.available | 2020-05-25T14:30:02Z | |
dc.date.issued | 2020-04-28 | |
dc.identifier | 268007866 | |
dc.identifier | 4e66a76d-e621-49a2-a97e-fcfe2b7e33da | |
dc.identifier | 000531250500001 | |
dc.identifier | 85085075718 | |
dc.identifier.citation | Xiang , 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/ab8229 | en |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2005.02592v1 | |
dc.identifier.other | ORCID: /0000-0002-8863-7828/work/74510006 | |
dc.identifier.uri | https://hdl.handle.net/10023/19988 | |
dc.description | This 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.abstract | We 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.extent | 672267 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astrophysical Journal | en |
dc.subject | Stellar activity (1580) | en |
dc.subject | Close binary stars (254) | en |
dc.subject | Doppler imaging (400) | en |
dc.subject | Starspots (1572) | en |
dc.subject | QB Astronomy | en |
dc.subject | 3rd-DAS | en |
dc.subject.lcc | QB | en |
dc.title | Doppler imaging and differential rotation of σ 2 Coronae Borealis using SONG | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. St Andrews Centre for Exoplanet Science | en |
dc.identifier.doi | 10.3847/1538-4357/ab8229 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2020-04-28 |
This item appears in the following Collection(s)
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.