Modelling Kepler red giants in eclipsing binaries: calibrating the mixing-length parameter with asteroseismology
Article
Article Title | Modelling Kepler red giants in eclipsing binaries: calibrating the mixing-length parameter with asteroseismology |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Li, Tanda (Author), Bedding, Timothy R. (Author), Huber, Daniel (Author), Ball, Warrick H. (Author), Stello, Dennis (Author), Murphy, Simon J. (Author) and Bland-Hawthorn, Joss (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 475 (1), pp. 981-998 |
Number of Pages | 18 |
Year | 2017 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stx3079 |
Web Address (URL) | https://academic.oup.com/mnras/article/475/1/981/4712223 |
Abstract | Stellar models rely on a number of free parameters. High-quality observations of eclipsing binary stars observed by Kepler offer a great opportunity to calibrate model parameters for evolved stars. Our study focuses on six Kepler red giants with the goal of calibrating the mixing-length parameter of convection as well as the asteroseismic surface term in models. We introduce a new method to improve the identification of oscillation modes that exploits theoretical frequencies to guide the mode identification ('peak-bagging') stage of the data analysis. Our results indicate that the convective mixing-length parameter (α) is ≈14 per cent larger for red giants than for the Sun, in agreement with recent results from modelling the APOGEE stars.We found that the asteroseismic surface term (i.e. the frequency offset between the observed and predicted modes) correlates with stellar parameters (Teff, log g) and the mixing-length parameter. This frequency offset generally decreases as giants evolve. The two coefficients a-1 and a3 for the inverse and cubic terms that have been used to describe the surface term correction are found to correlate linearly. The effect of the surface term is also seen in the p-g mixed modes; however, established methods for correcting the effect are not able to properly correct the g-dominated modes in late evolved stars. |
Keywords | stars: evolution; stars: oscillations; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Sydney |
Aarhus University, Denmark |
https://research.usq.edu.au/item/q7396/modelling-kepler-red-giants-in-eclipsing-binaries-calibrating-the-mixing-length-parameter-with-asteroseismology
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