The Second APOKASC Catalog: The Empirical Approach

By M. Pinsonneault, Y. Elsworth, J. Tayar, A. Serenelli, D. Stello, Joel C. Zinn, S. Mathur, Rafael A. Garc'ia, Jennifer A. Johnson, S. Hekker and 26 more. Astrophysical Journal Supplement Series, 2018

193 citations recorded by the source corpus.

We present a catalog of stellar properties for a large sample of 6676 evolved stars with Apache Point Observatory Galactic Evolution Experiment spectroscopic parameters and Kepler asteroseismic data analyzed using five independent techniques. Our data include evolutionary state, surface gravity, mean density, mass, radius, age, and the spectroscopic and asteroseismic measurements used to derive them. We employ a new empirical approach for combining asteroseismic measurements from different methods, calibrating the inferred stellar parameters, and estimating uncertainties. With high statistical significance, we find that asteroseismic parameters inferred from the different pipelines have systematic offsets that are not removed by accounting for differences in their solar reference values. We include theoretically motivated corrections to the large frequency spacing (Δν) scaling relation, and we calibrate the zero-point of the frequency of the maximum power (νmax) relation to be consistent with masses and radii for members of star clusters. For most targets, the parameters returned by different pipelines are in much better agreement than would be expected from the pipeline-predicted random errors, but 22% of them had at least one method not return a result and a much larger measurement dispersion. This supports the usage of multiple analysis techniques for asteroseismic stellar population studies. The measured dispersion in mass estimates for fundamental calibrators is consistent with our error model, which yields median random and systematic mass uncertainties for RGB stars of order 4%. Median random and systematic mass uncertainties are at the 9% and 8% level, respectively, for red clump stars.

Subfields: Astronomy and Astrophysics, Computational Mechanics

View Paper: https://www.semanticscholar.org/paper/905326cb84473055a4f8ee02400819248eddc9c8

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Citations in the corpus

Confirmation of the Gaia DR2 Parallax Zero-point Offset Using Asteroseismology and Spectroscopy in the Kepler Field (2018, background): “The basis of our data set is a sample of 6676 Kepler red giants with asteroseismic and spectroscopic data taken from Pinsonneault et al. (2018), hereafter APOKASC-2.”
The Gaia–Kepler Stellar Properties Catalog. I. Homogeneous Fundamental Properties for 186,301 Kepler Stars (2020, background): “…work on M-dwarfs (Gaidos et al., in prep) and previously published work on the APOGEE Kepler Giants with asteroseismic data (APOKASC, Serenelli et al. 2017; Pinsonneault et al. 2018) are more specialized and hence better alternatives to the data we derive here for these specific samples of stars.”
The Fifteenth Data Release of the Sloan Digital Sky Surveys: First Release of MaNGA-derived Quantities, Data Visualization Tools, and Stellar Library (2018, methodology): “…new APOGEE-related technical papers are highlighted below: the instrument paper from Wilson et al. (2018) that relays an extensive description of the APOGEE spectrographs, and the APOKASC paper from Pinsonneault et al. (2018) that details the APOGEE spectroscopic follow-up of Kepler stars.”