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

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)3647-3656
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume492
Issue number3
Early online date25 Jan 2020
DOIs
Publication statusPublished - Mar 2020

Keywords

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

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