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Resolving Power of Asteroseismic Inversion of the Kepler Legacy Sample

Published online by Cambridge University Press:  24 September 2020

Alexander G. Kosovichev Open the ORCID record for Alexander G. Kosovichev [Opens in a new window]  and
Irina N. Kitiashvili Open the ORCID record for Irina N. Kitiashvili [Opens in a new window]
Alexander G. Kosovichev
Affiliation:
New Jersey Institute of Technology, Newark, NJ07102, U.S.A. email: mailto:[email protected]
Irina N. Kitiashvili
Affiliation:
NASA Ames Research CenterMoffett Field, CA94035, U.S.A. email: mailto:[email protected]
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Abstract

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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.

Keywords

stars: interiorsstars: late-typestars: oscillationsmethods: data analysisstars: individual (KIC 10162436KIC 5773345)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 107 - 115
Copyright
© International Astronomical Union 2020

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