The evolution of surface magnetic fields in young solar-type stars I: the first 250 Myr
Article
Article Title | The evolution of surface magnetic fields in young solar-type stars I: the first 250 Myr |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Folsom, C. P. (Author), Petit, P. (Author), Bouvier, J. (Author), Lebre, A. (Author), Amard, L. (Author), Palacios, A. (Author), Morin, J. (Author), Donati, J.-F. (Author), Jeffers, S. V. (Author), Marsden, S. C. (Author) and Vidotto, A. A. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 457 (1), pp. 580-607 |
Number of Pages | 28 |
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/stv2924 |
Web Address (URL) | https://academic.oup.com/mnras/article/457/1/580/988747 |
Abstract | The surface rotation rates of young solar-type stars vary rapidly with age from the end of the pre-main sequence through the early main sequence. Important changes in the dynamos operating in these stars may result from this evolution, which should be observable in their surface magnetic fields. Here we present a study aimed at observing the evolution of these magnetic fields through this critical time period. We observed stars in open clusters and stellar associations of known ages, and used Zeeman Doppler imaging to characterize their complex magnetic large-scale fields. Presented here are results for 15 stars, from five associations, with ages from 20 to 250 Myr, masses from 0.7 to 1.2 M⊙, and rotation periods from 0.4 to 6 d. We find complex large-scale magnetic field geometries, with global average strengths from 14 to 140 G. There is a clear trend towards decreasing average large-scale magnetic field strength with age, and a tight correlation between magnetic field strength and Rossby number. Comparing the magnetic properties of our zero-age main-sequence sample to those of both younger and older stars, it appears that the magnetic evolution of solar-type stars during the pre-main sequence is primarily driven by structural changes, while it closely follows the stars’ rotational evolution on the main sequence. |
Keywords | polarimetric, stars, formation, imaging, magnetic field, rotation, solar, type |
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. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Grenoble Alpes University, France |
University of Toulouse, France | |
University of Montpellier, France | |
Montpellier Universe and Particles Laboratory, France | |
Georg August University of Gottingen, Germany | |
Computational Engineering and Science Research Centre | |
Geneva Observatory, Switzerland |
https://research.usq.edu.au/item/q3w2z/the-evolution-of-surface-magnetic-fields-in-young-solar-type-stars-i-the-first-250-myr
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Folsom 2016 Monthly Notices of the Royal Astronomical Society 457 580-607.pdf | ||
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