The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
Marc H. Pinsonneault, Yvonne Elsworth, Courtney Epstein, Saskia, Hekker, Sz. M\'esz\'aros, William J. Chaplin, Jennifer A. Johnson, Rafael A., Garc\'ia, Jon Holtzman, Savita Mathur, Ana Garc\'ia P\'erez, Victor Silva, Aguirre, L\'eo Girardi, Sarbani Basu, Matthew Shetrone

TL;DR
The APOKASC catalog combines asteroseismic and spectroscopic data for 1916 Kepler field red giants, providing precise stellar parameters and insights into systematic uncertainties and calibration differences.
Contribution
This work presents the first combined asteroseismic and spectroscopic catalog for Kepler red giants, including detailed error analysis and calibration comparisons.
Findings
Asteroseismic gravities are more precise than spectroscopic ones.
Effective temperature scale is 0-200 K cooler than Infrared Flux Method expectations.
Good agreement between APOKASC and KIC metallicity scales, with some systematic offsets.
Abstract
We present the first APOKASC catalog of spectroscopic and asteroseismic properties of 1916 red giants observed in the Kepler fields. The spectroscopic parameters provided from the Apache Point Observatory Galactic Evolution Experiment project are complemented with asteroseismic surface gravities, masses, radii, and mean densities determined by members of the Kepler Asteroseismology Science Consortium. We assess both random and systematic sources of error and include a discussion of sample selection for giants in the Kepler fields. Total uncertainties in the main catalog properties are of order 80 K in Teff , 0.06 dex in [M/H], 0.014 dex in log g, and 12% and 5% in mass and radius, respectively; these reflect a combination of systematic and random errors. Asteroseismic surface gravities are substantially more precise and accurate than spectroscopic ones, and we find good agreement…
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