The connection between stellar activity cycles and magnetic field topology
Article
Article Title | The connection between stellar activity cycles and magnetic field topology |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | See, V. (Author), Jardine, M. (Author), Vidotto, A. A. (Author), Donati, J.-F. (Author), Boro Saikia, S. (Author), Bouvier, J. (Author), Fares, R. (Author), Folsom, C. P. (Author), Gregory, S. G. (Author), Hussain, G. (Author), Jeffers, S. V. (Author), Marsden, S. C. (Author), Morin, J. (Author), Moutou, C. (Author), do Nascimento Jr., J. D. (Author), Petit, P. (Author) and Waite, I. A. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 462 (4), pp. 4442-4450 |
Number of Pages | 9 |
Year | 2016 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stw2010 |
Web Address (URL) | https://academic.oup.com/mnras/article/462/4/4442/2589999 |
Abstract | Zeeman Doppler imaging has successfully mapped the large-scale magnetic fields of stars over a large range of spectral types, rotation periods and ages. When observed over multiple epochs, some stars show polarity reversals in their global magnetic fields. On the Sun, polarity reversals are a feature of its activity cycle. In this paper, we examine the magnetic properties of stars with existing chromospherically determined cycle periods. Previous authors have suggested that cycle periods lie on multiple branches, either in the cycle period-Rossby number plane or the cycle period-rotation period plane. We find some evidence that stars along the active branch show significant average toroidal fields that exhibit large temporal variations while stars exclusively on the inactive branch remain dominantly poloidal throughout their entire cycle. This lends credence to the idea that different shear layers are in operation along each branch. There is also evidence that the short magnetic polarity switches observed on some stars are characteristic of the inactive branch while the longer chromospherically determined periods are characteristic of the active branch. This may explain the discrepancy between the magnetic and chromospheric cycle periods found on some stars. These results represent a first attempt at linking global magnetic field properties obtained form ZDI and activity cycles. |
Keywords | polarimetric; evolution; stars; magnetic fields; rotation |
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 ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of St Andrews, United Kingdom |
University of Geneva, Switzerland | |
University of Toulouse, France | |
Georg August University of Gottingen, Germany | |
Grenoble Alpes University, France | |
National Institute of Astrophysics, Italy | |
European Southern Observatory (ESO), Germany | |
University of Gottingen, Germany | |
Computational Engineering and Science Research Centre | |
University of Montpellier, France | |
Marseille Observatory, France | |
Federal University of Rio Grande do Norte, Brazil | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q39yq/the-connection-between-stellar-activity-cycles-and-magnetic-field-topology
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