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  Asteroseismology of luminous red giants with Kepler I: long-period variables with radial and non-radial modes

Yu, J., Bedding, T. R., Stello, D., Huber, D., Compton, D. L., Gizon, L., et al. (2020). Asteroseismology of luminous red giants with Kepler I: long-period variables with radial and non-radial modes. Monthly Notices of the Royal Astronomical Society, 493(1), 1388-1403. doi:10.1093/mnras/staa300.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-F538-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-F539-6
Genre: Journal Article

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Yu , Jie1, Author
Bedding, Timothy R, Author
Stello, Dennis, Author
Huber, Daniel, Author
Compton, Douglas L, Author
Gizon, Laurent2, Author              
Hekker, Saskia3, Author              
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              
2Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              
3Max 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: While long-period variables (LPVs) have been extensively investigated, especially with MACHO and OGLE data for the Magellanic Clouds, there still exist open questions in their pulsations regarding the excitation mechanisms, radial order, and angular degree assignment. Here, we perform asteroseismic analyses on LPVs observed by the 4-year Kepler mission. Using a cross-correlation method, we detect unambiguous pulsation ridges associated with radial fundamental modes (n = 1) and overtones (n ≥ 2), where the radial order assignment is made using theoretical frequencies and observed frequencies. Our results confirm that the amplitude variability seen in semiregulars is consistent with oscillations being solar-like. We identify that the dipole modes, l = 1, are dominant in the radial orders of 3 ≤ n ≤ 6, and that quadrupole modes, l = 2, are dominant in the first overtone n = 2. A test of seismic scaling relations using Gaia DR2 parallaxes reveals the possibility that the relations break down when νmax ≲ 3 μHz (R ≳ 40 R⊙, or log L/L⊙ ≳ 2.6). Our homogeneous measurements of pulsation amplitude and period for 3213 LPVs will be valuable for probing effects of pulsation on mass-loss, in particular in those stars with periods around 60 d, which has been argued as a threshold of substantial pulsation-triggered mass-loss.

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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: 10.1093/mnras/staa300
 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: 493 (1) Sequence Number: - Start / End Page: 1388 - 1403 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150