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  The Influence of Metallicity on Stellar Differential Rotation and Magnetic Activity

Karoff, C., Metcalfe, T. S., Santos, Â. R. G., Montet, B. T., Isaacson, H., Witzke, V., et al. (2018). The Influence of Metallicity on Stellar Differential Rotation and Magnetic Activity. The Astrophysical Journal, 852(1): 46. doi:10.3847/1538-4357/aaa026.

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Genre: Journal Article

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 Creators:
Karoff, Christoffer, Author
Metcalfe, Travis S., Author
Santos, Ângela R. G., Author
Montet, Benjamin T., Author
Isaacson, Howard, Author
Witzke, Veronika, Author
Shapiro, Alexander1, 2, Author              
Mathur, Savita, Author
Davies, Guy R., Author
Lund, Mikkel N., Author
Garcia, Rafael A., Author
Brun, Allan S., Author
Salabert, David, Author
Avelino, Pedro P., Author
van Saders, Jennifer, Author
Egeland, Ricky, Author
Cunha, Margarida S., Author
Campante, Tiago L., Author
Chaplin, William J., Author
Krivova, Natalie A.1, Author              
Solanki, Sami K.1, Author              Stritzinger, Maximilian, AuthorKnudsen, Mads F., Author more..
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2ERC Starting Grant: Connecting Solar and Stellar Variabilities (SOLVe), Max Planck Institute for Solar System Research, Max Planck Society, ou_3164811              

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 Abstract: Observations of Sun-like stars over the past half-century have improved our understanding of how magnetic dynamos, like that responsible for the 11 yr solar cycle, change with rotation, mass, and age. Here we show for the first time how metallicity can affect a stellar dynamo. Using the most complete set of observations of a stellar cycle ever obtained for a Sun-like star, we show how the solar analog HD 173701 exhibits solar-like differential rotation and a 7.4 yr activity cycle. While the duration of the cycle is comparable to that generated by the solar dynamo, the amplitude of the brightness variability is substantially stronger. The only significant difference between HD 173701 and the Sun is its metallicity, which is twice the solar value. Therefore, this provides a unique opportunity to study the effect of the higher metallicity on the dynamo acting in this star and to obtain a comprehensive understanding of the physical mechanisms responsible for the observed photometric variability. The observations can be explained by the higher metallicity of the star, which is predicted to foster a deeper outer convection zone and a higher facular contrast, resulting in stronger variability.

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Language(s): eng - English
 Dates: 2019-03-192018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/aaa026
 Degree: -

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Project name : ERC-2016-STG - SOLVe
Grant ID : 715947
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 852 (1) Sequence Number: 46 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3