Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. I. Oscillation Mode Parameters

Lund, Mikkel N.Silva Aguirre, Víctor; Davies, Guy R.; Chaplin, William J.; Christensen-Dalsgaard, Jørgen; Houdek, Günter; White, Timothy R.; Bedding, Timothy R.; Ball, Warrick H.; Huber, Daniel; Antia, H. M.; Lebreton, Yveline; Latham, David W.; Handberg, Rasmus; Verma, Kuldeep; Basu, Sarbani; Casagrande, Luca; Justesen, Anders B.; Kjeldsen, Hans; Mosumgaard, Jakob R.

Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. I. Oscillation Mode Parameters,
The Astrophysical Journal, Vol. 835, Issue 2


The advent of space-based missions like Kepler has revolutionized the study of solar-type stars, particularly through the measurement and modeling of their resonant modes of oscillation. Here we analyze a sample of 66 Kepler main-sequence stars showing solar-like oscillations as part of the Kepler seismic LEGACY project. We use Kepler short-cadence data, of which each star has at least 12 months, to create frequency-power spectra optimized for asteroseismology. For each star, we identify its modes of oscillation and extract parameters such as frequency, amplitude, and line width using a Bayesian Markov chain Monte Carlo “peak-bagging” approach.

We report the extracted mode parameters for all 66 stars, as well as derived quantities such as frequency difference ratios, the large and small separations Δν and δν02; the behavior of line widths with frequency and line widths at νmax with Teff, for which we derive parametrizations; and behavior of mode visibilities. These average properties can be applied in future peak-bagging exercises to better constrain the parameters of the stellar oscillation spectra. The frequencies and frequency ratios can tightly constrain the fundamental parameters of these solar-type stars, and mode line widths and amplitudes can test models of mode damping and excitation.

Key words: asteroseismology / stars: evolution / stars: fundamental parameters / stars: oscillations

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