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  Common dynamo scaling in slowly rotating young and evolved stars

Lehtinen, J., Spada, F., Käpylä, M. J., Olspert, N., & Käpylä, P. J. (2020). Common dynamo scaling in slowly rotating young and evolved stars. Nature astronomy, 4, 658-662. doi:10.1038/s41550-020-1039-x.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-EFF5-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-EFF6-8
Genre: Journal Article

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 Creators:
Lehtinen, Jyri1, Author              
Spada, Federico2, Author              
Käpylä, Maarit J.1, 3, Author              
Olspert, Nigul4, Author
Käpylä, Petri J., Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              
3Max Planck Research Group and ERC Consolidator Grant: Solar and Stellar Dynamos - SOLSTAR, Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_2265638              
4Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              

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 Abstract: One interpretation of the activity and magnetism of late-type stars is that these both intensify with decreasing Rossby number up to a saturation level1,2,3, suggesting that stellar dynamos depend on both rotation and convective turbulence4. Some studies have claimed, however, that rotation alone suffices to parametrize this scaling adequately5,6. Here, we tackle the question of the relevance of turbulence to stellar dynamos by including evolved, post-main-sequence stars in the analysis of the rotation–activity relation. These stars rotate very slowly compared with main-sequence stars, but exhibit similar activity levels7. We show that the two evolutionary stages fall together in the rotation–activity diagram and form a single sequence in the unsaturated regime in relation only to Rossby numbers derived from stellar models, confirming earlier preliminary results that relied on a more simplistic parametrization of the convective turn-over time8,9. This mirrors recent results of fully convective M dwarfs, which likewise fall on the same rotation–activity sequence as partially convective solar-type stars10,11. Our results demonstrate that turbulence plays a crucial role in driving stellar dynamos and suggest that there is a common turbulence-related dynamo mechanism explaining the magnetic activity of all late-type stars.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41550-020-1039-x
 Degree: -

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Title: Nature astronomy
Source Genre: Journal
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Publ. Info: London : Springer Nature
Pages: - Volume / Issue: 4 Sequence Number: - Start / End Page: 658 - 662 Identifier: ISSN: 2397-3366
CoNE: https://pure.mpg.de/cone/journals/resource/2397-3366