Magnetic fields and differential rotation on the pre-main sequence - III. The early-G star HD 106506
Article
Article Title | Magnetic fields and differential rotation on the pre-main sequence - III. The early-G star HD 106506 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Waite, I. A. (Author), Marsden, S. C. (Author), Carter, B. D. (Author), Hart, R. (Author), Donati, J. -F. (Author), Ramirez Velez, J. C. (Author), Semel, M. (Author) and Dunstone, N. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 413 (3), pp. 1949-1960 |
Number of Pages | 12 |
Year | 2011 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1365-2966.2011.18366.x |
Web Address (URL) | https://academic.oup.com/mnras/article/413/3/1949/966431 |
Abstract | We present the photometry and spectropolarimetry of the pre-main-sequence star HD 106506. A photometric rotational period of ˜1.416 ± 0.133 d has been derived using observations at Mount Kent Observatory (MKO). Spectropolarimetric data obtained with the 3.9-m Anglo-Australian Telescope (AAT) were used to derive spot occupancy and magnetic maps of the star through the technique of Zeeman Doppler imaging (ZDI). The resulting brightness maps indicate that HD 106506 displays photospheric spots at all latitudes including a predominant polar spot. Azimuthal and radial magnetic images of this star have been derived, and a significant azimuthal magnetic field is indicated, in line with other active young stars. A solar-like differential rotation law was incorporated into the imaging process. Using Stokes I information the equatorial rotation rate, Ωeq, was found to be 4.54 ± 0.01 rad d-1, with a photospheric shear δΩ of 0.21+0.02-0.03 rad d-1. This equates to an equatorial rotation period of ˜1.39 ± 0.01 d, with the equatorial region lapping the poles every ˜ 30+5-3 d. Using the magnetic features, the equatorial rotation rate, Ωeq, was found to be 4.51 ± 0.01 rad d-1, with a photospheric shear δΩ of 0.24 ± 0.03 rad d-1. This differential rotation is approximately four times that observed on the Sun. |
Keywords | profiles; activity; stars; Zeeman Doppler imaging; solar-type stars; HD106506; magnetic fields; spots |
ANZSRC Field of Research 2020 | 490303. Numerical solution of differential and integral equations |
510109. Stellar astronomy and planetary systems | |
510402. Condensed matter imaging | |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2011 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Centre for Astronomy, Solar Radiation and Climate |
Anglo-Australian Observatory, Australia | |
Institute for Research in Astrophysics and Planetology, France | |
Paris Sciences and Letters University, France | |
Laboratory of Space Science and Astrophysical Instrumentation, France | |
University of St Andrews, United Kingdom | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q1182/magnetic-fields-and-differential-rotation-on-the-pre-main-sequence-iii-the-early-g-star-hd-106506
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