Evolution of brightness and magnetic features of young solar-type stars – I. The young G star HIP 89829
Article
Article Title | Evolution of brightness and magnetic features of young solar-type stars – I. The young G star HIP 89829 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Perugini, G. M. (Author), Marsden, S. C. (Author), Waite, I. A. (Author), Jeffers, S. V. (Author), Piskunov, N. (Author), Shaw, N. (Author), Burton, D. M. (Author), Mengel, M. W. (Author), Hughes, J E and Hebrard, E. M. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 508 (3), pp. 3304-3320 |
Number of Pages | 17 |
Year | 2021 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stab2711 |
Web Address (URL) | https://academic.oup.com/mnras/article/508/3/3304/6377824 |
Abstract | The evolution in latitude of sunspots is a key feature of the cyclic solar dynamo. Here, we present the results of a spectroscopic and spectropolarimetric monitoring campaign on the young (~20 Myr old) early G star HIP 89829, in order to investigate potential evolution in the distribution of the star's spots and magnetic features. Our analysis of this G5V star spans eight epochs, from June 2010 to August 2015. The techniques of Doppler imaging and Zeeman-Doppler imaging were used to create brightness maps for each epoch and magnetic maps for two epochs. The brightness images show the star to have stable spot features with two main spot latitudes - a polar spot, often seen on young rapidly rotating stars such as this, and another highly unusual group of large spot features around the 20° and 30° latitudes. These lower spot latitudes appear to be rather stable over the 5 yr of observations. We included a solar-type differential rotation law into the imaging process and measured near-solid-body rotation for epochs where sufficient data exist for this analysis. The magnetic features show a dominant poloidal and a weaker toroidal magnetic field for both Stokes V epochs, which is unusual for a star with a rapid rotation period of 0.57 d. We conclude that HIP 89829 is an active young solar-type star with long-lived spots and near-solid-body rotation. |
Keywords | line: profiles; stars: individual: HIP 89829; stars: magnetic field; stars: solar-type; starspots |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Centre for Astrophysics |
Max Planck Society, Germany | |
Uppsala University, Sweden | |
Academic Registrar's Office | |
Centre for Astrophysics | |
No affiliation |
https://research.usq.edu.au/item/q703q/evolution-of-brightness-and-magnetic-features-of-young-solar-type-stars-i-the-young-g-star-hip-89829
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