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  Investigating surface correction relations for RGB stars

Jørgensen, A. C. S., Montalbán, J., Miglio, A., Rendle, B. M., Davies, G. R., Buldgen, G., et al. (2020). Investigating surface correction relations for RGB stars. Monthly Notices of the Royal Astronomical Society, 495(4), 4965-4980. doi:10.1093/mnras/staa1480.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-AB34-F Version Permalink: http://hdl.handle.net/21.11116/0000-0006-AB35-E
Genre: Journal Article

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 Creators:
Jørgensen, Andreas Christ Sølvsten , Author
Montalbán, Josefina, Author
Miglio, Andrea, Author
Rendle, Ben M, Author
Davies, Guy R, Author
Buldgen, Gaël, Author
Scuflaire, Richard, Author
Noels, Arlette, Author
Gaulme, Patrick1, Author              
García, Rafael A, Author
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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Free keywords: Asteroseismology, methods: statistical, stars: atmospheres, binaries: eclipsing, open clusters and associations: individual: 6819 and 6791
 Abstract: State-of-the-art stellar structure and evolution codes fail to adequately describe turbulent convection. For stars with convective envelopes such as red giants, this leads to an incomplete depiction of the surface layers. As a result, the predicted stellar oscillation frequencies are haunted by systematic errors, the so-called surface effect. Different empirically and theoretically motivated correction relations have been proposed to deal with this issue. In this paper, we compare the performance of these surface correction relations for red giant branch stars. For this purpose, we apply the different surface correction relations in asteroseismic analyses of eclipsing binaries and open clusters. In accordance with previous studies of main-sequence stars, we find that the use of different surface correction relations biases the derived global stellar properties, including stellar age, mass, and distance estimates. We, furthermore, demonstrate that the different relations lead to the same systematic errors for two different open clusters. Our results overall discourage from the use of surface correction relations that rely on reference stars to calibrate free parameters. Due to the demonstrated systematic biasing of the results, the use of appropriate surface correction relations is imperative to any asteroseismic analysis of red giants. Accurate mass, age, and distance estimates for red giants are fundamental when addressing questions that deal with the chemo-dynamical evolution of the Milky Way galaxy. In this way, our results also have implications for fields such as galactic archaeology that draw on findings from stellar physics.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/staa1480
ADS: 2020MNRAS.495.4965J
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 495 (4) Sequence Number: - Start / End Page: 4965 - 4980 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150