Resolving Power of Asteroseismic Inversion of the Kepler Legacy Sample

Abstract

The Kepler Asteroseismic Legacy Project provided frequencies, separation ratios, error estimates, and covariance matrices for 66 Kepler main sequence targets. Most of the previous analysis of these data was focused on fitting standard stellar models. We present results of direct asteroseismic inversions using the method of optimally localized averages (OLA), which effectively eliminates the surface effects and attempts to resolve the stellar core structure. The inversions are presented for various structure properties, including the density stratification and sound speed. The results show that the mixed modes observed in post-main sequence F-type stars allow us to resolve the stellar core structure and reveal significant deviations from the evolutionary models obtained by the grid-fitting procedure to match the observed oscillation frequencies.

9 pages, 5 figures

References in corpus (4)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• A precise asteroseismic age and radius for the evolved Sun-like star KIC 11026764
• Testing stellar evolution with asteroseismic inversions of a main sequence star harboring a small convective core

Cited by in corpus (5)

• On the feasibility of structure inversions for gravity-mode pulsators
• Asteroseismic Inference of the Central Structure in a Subgiant Star
• Asteroseismic Inversions for Internal Sound Speed Profiles of Main-sequence Stars with Radiative Cores
• Non-standard modeling of a possible blue straggler star, KIC 11145123
• Asteroseismic Structure Inversions of Main-Sequence Solar-like Oscillators with Convective Cores