The first Doppler imaging of the active binary prototype RS Canum Venaticorum

Yue Xiang; Shenghong Gu; U. Wolter; J. H. M. M. Schmitt; A. Collier Cameron; J. R. Barnes; M. Mittag; V. Perdelwitz; S. Kohl

doi:10.1093/mnras/staa063

The first Doppler imaging of the active binary prototype RS Canum Venaticorum

Yue Xiang, Shenghong Gu, U. Wolter, J. H. M. M. Schmitt, A. Collier Cameron, J. R. Barnes, M. Mittag, V. Perdelwitz, S. Kohl

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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/Ω_eq = -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.

Original language	English
Pages (from-to)	3647-3656
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	492
Issue number	3
Early online date	25 Jan 2020
DOIs	https://doi.org/10.1093/mnras/staa063
Publication status	Published - Mar 2020

Keywords

Stars: activity
Stars: binaries: eclipsing
Stars: imaging
Stars: star-spots
Stars: individual: RS CVn

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10.1093/mnras/staa063

Xiang-2020-First-Doppler-imaging-MNRAS-3647
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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http://adsabs.harvard.edu/abs/2020MNRAS.492.3647X

Cite this

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title = "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.",

keywords = "Stars: activity, Stars: binaries: eclipsing, Stars: imaging, Stars: star-spots, Stars: individual: RS CVn",

author = "Yue Xiang and Shenghong Gu and U. Wolter and Schmitt, {J. H. M. M.} and Cameron, {A. Collier} and Barnes, {J. R.} and M. Mittag and V. Perdelwitz and S. Kohl",

year = "2020",

month = mar,

doi = "10.1093/mnras/staa063",

language = "English",

volume = "492",

pages = "3647--3656",

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T1 - The first Doppler imaging of the active binary prototype RS Canum Venaticorum

AU - Xiang, Yue

AU - Gu, Shenghong

AU - Wolter, U.

AU - Schmitt, J. H. M. M.

AU - Cameron, A. Collier

AU - Barnes, J. R.

AU - Mittag, M.

AU - Perdelwitz, V.

AU - Kohl, S.

PY - 2020/3

Y1 - 2020/3

N2 - 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.

AB - 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.

KW - Stars: activity

KW - Stars: binaries: eclipsing

KW - Stars: imaging

KW - Stars: star-spots

KW - Stars: individual: RS CVn

U2 - 10.1093/mnras/staa063

DO - 10.1093/mnras/staa063

M3 - Article

SN - 0035-8711

VL - 492

SP - 3647

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

The first Doppler imaging of the active binary prototype RS Canum Venaticorum

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