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  The Evolution of Rotation and Magnetic Activity in 94 Aqr Aa from Asteroseismology with TESS

Metcalfe, T. S., van Saders, J. L., Basu, S., Buzasi, D., Chaplin, W. J., Egeland, R., et al. (2020). The Evolution of Rotation and Magnetic Activity in 94 Aqr Aa from Asteroseismology with TESS. The Astrophysical Journal, 900: 154. doi:10.3847/1538-4357/aba963.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-1DE8-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-1DE9-3
Genre: Journal Article

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 Creators:
Metcalfe, Travis S.1, Author
van Saders, Jennifer L., Author
Basu, Sarbani, Author
Buzasi, Derek, Author
Chaplin, William J., Author
Egeland, Ricky, Author
Garcia, Rafael A., Author
Gaulme, Patrick1, Author              
Huber, Daniel, Author
Reinhold, Timo2, Author              
Schunker, Hannah1, Author              
Stassun, Keivan G., Author
Appourchaux, Thierry, Author
Ball, Warrick H., Author
Bedding, Timothy R., Author
Deheuvels, Sébastien, Author
González-Cuesta, Lucía, Author
Handberg, Rasmus, Author
Jiménez, Antonio, Author
Kjeldsen, Hans, Author
Li, Tanda, AuthorLund, Mikkel N., AuthorMathur, Savita, AuthorMosser, Benoit, AuthorNielsen, Martin B., AuthorNoll, Anthony, AuthorOrhan, Zeynep Çelik, AuthorÖrtel, Sibel, AuthorSantos, Ângela R. G., AuthorYildiz, Mutlu, AuthorBaliunas, Sallie, AuthorSoon, Willie, Author more..
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              
2Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              

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Free keywords: Stellar activity ; Stellar evolution ; Stellar oscillations ; Stellar rotation
 Abstract: Most previous efforts to calibrate how rotation and magnetic activity depend on stellar age and mass have relied on observations of clusters, where isochrones from stellar evolution models are used to determine the properties of the ensemble. Asteroseismology employs similar models to measure the properties of an individual star by matching its normal modes of oscillation, yielding the stellar age and mass with high precision. We use 27 days of photometry from the Transiting Exoplanet Survey Satellite to characterize solar-like oscillations in the G8 subgiant of the 94 Aqr triple system. The resulting stellar properties, when combined with a reanalysis of 35 yr of activity measurements from the Mount Wilson HK project, allow us to probe the evolution of rotation and magnetic activity in the system. The asteroseismic age of the subgiant agrees with a stellar isochrone fit, but the rotation period is much shorter than expected from standard models of angular momentum evolution. We conclude that weakened magnetic braking may be needed to reproduce the stellar properties, and that evolved subgiants in the hydrogen shell-burning phase can reinvigorate large-scale dynamo action and briefly sustain magnetic activity cycles before ascending the red giant branch.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/aba963
arXiv: 2007.12755
ADS: 2020ApJ...900..154M
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Affiliations:
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 900 Sequence Number: 154 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3