A Homogeneous Catalog of Oscillating Solar-Type Stars Observed by the Kepler Mission and a New Amplitude Scaling Relation Including Chromospheric Activity

Abstract

We present a homogeneous catalog of global asteroseismic parameters and derived stellar parameters for 765 Kepler main-sequence and subgiant stars. The catalog was produced by re-analyzing all available Kepler DR25 short-cadence data using pySYD, an automated pipeline to extract global asteroseismic parameters. We find 50 new detections, seven of which are also planet candidate host stars. We find excellent agreement between our ${\nu }_{\text{max}}$ and $\Delta \nu$ measurements and literature values, with an average offset of $0.2\pm 0.4\%$ ($\sigma =5\%$) and $0.2\pm 0.7\%$ ($\sigma =2\%$), respectively. In addition, we derive stellar radii and masses with an average precision of $2.7\%$ and $10.4\%$, respectively, and find a mean offset of $0.8\pm 0.2\%$ ($\sigma =6\%$) between our radii derived with asteroseismology and those from Gaia parallaxes. Using spectroscopic $\log R_{\text{HK}}^{\prime }$ activity measurements from Keck/HIRES, we derive an amplitude scaling relation with an activity term for main-sequence and subgiant stars, which successfully predicts amplitudes with a precision of $\approx 8-9\%$. Our work is the largest and most homogeneous asteroseismic catalog of Kepler main-sequence and subgiant stars to date, including a total of 101 stars hosting planet candidates and 451 stars with measured rotation periods.

arXiv comment26 pages, 18 figures, 6 tables, accepted in AJ

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