Realistic Uncertainties for Fundamental Properties of Asteroseismic Red Giants and the Interplay between Mixing Length, Metallicity, and vmax
Article
Li, Yaguang, Bedding, Timothy R., Huber, Daniel, Stello, Dennis, van Saders, Jennifer, Zhou, Yixiao, Crawford, Courtney L., Joyce, Meridith, Li, Tanda, Murphy, Simon J. and Sreenivas, K. R.. 2024. "Realistic Uncertainties for Fundamental Properties of Asteroseismic Red Giants and the Interplay between Mixing Length, Metallicity, and vmax." The Astrophysical Journal: an international review of astronomy and astronomical physics. 974 (1). https://doi.org/10.3847/1538-4357/ad6c3e
Article Title | Realistic Uncertainties for Fundamental Properties of Asteroseismic Red Giants and the Interplay between Mixing Length, Metallicity, and vmax |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Li, Yaguang, Bedding, Timothy R., Huber, Daniel, Stello, Dennis, van Saders, Jennifer, Zhou, Yixiao, Crawford, Courtney L., Joyce, Meridith, Li, Tanda, Murphy, Simon J. and Sreenivas, K. R. |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 974 (1) |
Article Number | 77 |
Number of Pages | 13 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ad6c3e |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ad6c3e |
Abstract | Asteroseismic modeling is a powerful way to derive stellar properties. However, the derived quantities are limited by built-in assumptions used in stellar models. This work presents a detailed characterization of stellar model uncertainties in asteroseismic red giants, focusing on the mixing-length parameter alpha(MLT), the initial helium fraction Y-init, the solar abundance scale, and the overshoot parameters. First, we estimate error floors due to model uncertainties to be approximate to 0.4% in mass, approximate to 0.2% in radius, and approximate to 17% in age, primarily due to the uncertain state of alpha(MLT) and Y-init. The systematic uncertainties in age exceed typical statistical uncertainties, suggesting the importance of their evaluation in asteroseismic applications. Second, we demonstrate that the uncertainties from alpha(MLT) can be entirely mitigated by direct radius measurements or partially through nu(max). Utilizing radii from Kepler eclipsing binaries, we determined the alpha(MLT) values and calibrated the alpha(MLT)-[M/H] relation. The correlation observed between the two variables is positive, consistent with previous studies using 1D stellar models, but in contrast with outcomes from 3D simulations. Third, we explore the implications of using asteroseismic modeling to test the nu(max) scaling relation. We found that a perceived dependency of nu(max) on [M/H] from individual frequency modeling can be largely removed by incorporating the calibrated alpha(MLT)-[M/H] relation. Variations in Y-init can also affect nu(max) predictions. These findings suggest that nu(max) conveys information not fully captured by individual frequencies, and that it should be carefully considered as an important observable for asteroseismic modeling. |
Keywords | Stellar oscillations ; Low mass stars |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | University of Hawaii, United States |
University of Sydney | |
University of New South Wales | |
Aarhus University, Denmark | |
Konkoly Observatory, Hungary | |
Beijing Normal University, China | |
Centre for Astrophysics |
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