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  Insights from the APOKASC determination of the evolutionary state of red-giant stars by consolidation of different methods

Elsworth, Y., Hekker, S., Johnson, J. A., Kallinger, T., Mosser, B., Pinsonneault, M., et al. (2019). Insights from the APOKASC determination of the evolutionary state of red-giant stars by consolidation of different methods. Monthly Notices of the Royal Astronomical Society, 489(4), 4641-4657. doi:10.1093/mnras/stz2356.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-68FB-B Version Permalink: http://hdl.handle.net/21.11116/0000-0006-68FC-A
Genre: Journal Article

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 Creators:
Elsworth, Yvonne, Author
Hekker, Saskia1, Author              
Johnson, Jennifer A, Author
Kallinger, Thomas, Author
Mosser, Benoit, Author
Pinsonneault, Marc, Author
Hon, Marc, Author
Kuszlewicz, James S.1, Author              
Miglio, Andrea, Author
Serenelli, Aldo, Author
Stello, Dennis, Author
Tayar, Jamie, Author
Vrard, Mathieu, Author
Affiliations:
1Max 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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 Abstract: The internal working of low-mass stars is of great significance to both the study of stellar structure and the history of the Milky Way. Asteroseismology has the power to directly sense the internal structure of stars and allows for the determination of the evolutionary state – i.e. has helium burning commenced or is the energy generated only by the fusion in the hydrogen-burning shell? We use observational data from red-giant stars in a combination (known as APOKASC) of asteroseismology (from the Kepler mission) and spectroscopy (from SDSS/APOGEE). The new feature of the analysis is that the APOKASC evolutionary state determination is based on the comparison of diverse approaches to the investigation of the frequency-power spectrum. The high level of agreement between the methods is a strong validation of the approaches. Stars for which there is not a consensus view are readily identified. The comparison also facilitates the identification of unusual stars including those that show evidence for very strong coupling between p and g cavities. The comparison between the classification based on the spectroscopic data and asteroseismic data have led to a new value for the statistical uncertainty in APOGEE temperatures. These consensus evolutionary states will be used as an input for methods that derive masses and ages for these stars based on comparison of observables with stellar evolutionary models (‘grid-based modelling’) and as a training set for machine-learning and other data-driven methods of evolutionary state determination.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz2356
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 489 (4) Sequence Number: - Start / End Page: 4641 - 4657 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150