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19 April 2024 |
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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
; | | Date: |
8 Jan 2020 | | Abstract: | We present the first Doppler images of the prototypical active binary star RS
CVn, derived from high-resolution spectra observed in 2004, 2016 and 2017,
using three different telescopes and observing sites. We apply the
least-squares deconvolution technique to all observed spectra to obtain high
signal-to-noise line profiles, which are used to derive the surface images of
the active K-type component. Our images show a complex spot pattern on the K
star, distributed widely in longitude. All starspots revealed by our Doppler
images are located below a latitude of about 70$^{circ}$. In accordance with
previous light-curve modeling studies, we find no indication of a polar spot on
the K star. Using Doppler images derived from two consecutive rotational
cycles, we estimate a surface differential rotation rate of $DeltaOmega =
-0.039 pm 0.003 ~rad~d^{-1}$ and $alpha = DeltaOmega/Omega_{eq} = -0.030
pm 0.002$ for the K star. Given the limited phase coverage during those two
rotations, the uncertainty of our differential rotation estimate is presumably
higher. | | Source: | arXiv, 2001.2572 | | Services: | Forum | Review | PDF | Favorites | |
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