The first Doppler imaging of the active binary prototype RS Canum Venaticorum
Abstract
We present the first Doppler images of the prototypical active binarystar RS Canum Venaticorum, derived from high-resolution spectra observedin 2004, 2016 and 2017, using three different telescopes and observingsites. We apply the least-squares deconvolution technique to allobserved spectra to obtain high signal-to-noise line profiles, which areused to derive the surface images of the active K-type component. Ourimages show a complex spot pattern on the K star, distributed widely inlongitude. All star-spots revealed by our Doppler images are locatedbelow a latitude of about 70°. In accordance with previouslight-curve modelling studies, we find no indication of a polar spot onthe K star. Using Doppler images derived from two consecutive rotationalcycles, we estimate a surface differential rotation rate ofΔΩ = -0.039 ± 0.003 rad d-1 and α =ΔΩ/Ωeq = -0.030 ± 0.002 for the Kstar. Given the limited phase coverage during those two rotations, theuncertainty of our differential rotation estimate is presumably higher.
Citation
Xiang , Y , Gu , S , Wolter , U , Schmitt , J H M M , Cameron , A C , Barnes , J R , Mittag , M , Perdelwitz , V & Kohl , S 2020 , ' The first Doppler imaging of the active binary prototype RS Canum Venaticorum ' , Monthly Notices of the Royal Astronomical Society , vol. 492 , no. 3 , pp. 3647-3656 . https://doi.org/10.1093/mnras/staa063
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Rights
Copyright © 2020 the Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. 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 final published version of the work, which was originally published at https://doi.org/10.1093/mnras/staa063
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