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- W4384389929 abstract "We present measurements of the dipole mode asymptotic period spacing ($DeltaPi_1$), the coupling factor between p- and g- modes ($q$), the g-mode phase offset ($epsilon_g$), and the mixed-mode frequency rotational splitting ($deltanu_{mathrm{rot}}$) for 1,074 low-luminosity red giants from the Kepler mission. Using oscillation mode frequencies extracted from each star, we apply Bayesian optimization to estimate $DeltaPi_1$ from the power spectrum of the stretched period spectrum and to perform the subsequent forward modelling of the mixed-mode frequencies. With our measurements, we show that the mode coupling factor $q$ shows significant anti-correlation with both stellar mass and metallicity, and can reveal highly metal-poor stars. We present the evolution of $epsilon_g$ up the lower giant branch up to before the luminosity bump, and find no significant trends in $epsilon_g$ or $deltanu_{mathrm{rot}}$ with stellar mass and metallicity in our sample. Additionally, we identify six new red giants showing anomalous distortions in their g-mode pattern. Our data products, code, and results are provided in a public repository." @default.
- W4384389929 created "2023-07-15" @default.
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- W4384389929 date "2023-07-12" @default.
- W4384389929 modified "2023-09-25" @default.
- W4384389929 title "Mixed-mode Ensemble Asteroseismology of Low-Luminosity Kepler Red Giants" @default.
- W4384389929 doi "https://doi.org/10.48550/arxiv.2307.06482" @default.
- W4384389929 hasPublicationYear "2023" @default.
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