Stellar magnetism: empirical trends with age and rotation
Article
Article Title | Stellar magnetism: empirical trends with age and rotation |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Vidotto, A. A. (Author), Gregory, S. G. (Author), Jardine, M. (Author), Donati, J. -F. (Author), Petit, P. (Author), Morin, J. (Author), Folsom, C. P. (Author), Bouvier, J. (Author), Cameron, A. C. (Author), Hussain, G. (Author), Marsden, S. (Author), Waite, I. A. (Author), Fares, R. (Author), Jeffers, S. (Author) and do Nascimento Jr., J.-D. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 441 (3), pp. 2361-2374 |
Number of Pages | 14 |
Year | 2014 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stu728 |
Web Address (URL) | https://academic.oup.com/mnras/article/441/3/2361/1127607 |
Abstract | We investigate how the observed large-scale surface magnetic fields of low-mass stars (̃0.1-2M⊙), reconstructed through Zeeman-Doppler imaging, vary with age t, rotation and X-ray emission. Our sample consists of 104 magnetic maps of 73 stars, from accreting premain sequence to main-sequence objects (1 Myr ≲ t ≲ 10 Gyr). For non-accreting dwarfs we empirically find that the unsigned average large-scale surface field is related to age as t-0.655 ± 0.045. This relation has a similar dependence to that identified by Skumanich, used as the basis for gyrochronology. Likewise, our relation could be used as an age-dating method ('magnetochronology'). The trends with rotation we find for the large-scale stellar magnetism are consistent with the trends found from Zeeman broadening measurements (sensitive to large-and small-scale fields). These similarities indicate that the fields recovered from both techniques are coupled to each other, suggesting that small-and large-scale fields could share the same dynamo field generation processes. For the accreting objects, fewer statistically significant relations are found, with one being a correlation between the unsigned magnetic flux and rotation period. We attribute this to a signature of star-disc interaction, rather than being driven by the dynamo. |
Keywords | planetary systems; stars; evolution; magnetic field; rotation; polarimetric techniques |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
519999. Other physical sciences not elsewhere classified | |
510903. Mesospheric, thermospheric, ionospheric and magnetospheric physics | |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 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 Toulouse, France | |
University of Montpellier, France | |
Institute of Planetology and Astrophysics of Grenoble, France | |
European Southern Observatory (ESO), Germany | |
Computational Engineering and Science Research Centre | |
Georg August University of Gottingen, Germany | |
Federal University of Rio Grande do Norte, Brazil | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q277z/stellar-magnetism-empirical-trends-with-age-and-rotation
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