APOKASC-3: The Third Joint Spectroscopic and Asteroseismic catalog for Evolved Stars in the Kepler Fields
In the third APOKASC catalog, we present data for the complete sample of 15,808 evolved stars with APOGEE spectroscopic parameters and Kepler asteroseismology. We used ten independent asteroseismic analysis techniques and anchor our system on fundamental radii derived from Gaia $L$ and spectroscopic...
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Zusammenfassung: | In the third APOKASC catalog, we present data for the complete sample of
15,808 evolved stars with APOGEE spectroscopic parameters and Kepler
asteroseismology. We used ten independent asteroseismic analysis techniques and
anchor our system on fundamental radii derived from Gaia $L$ and spectroscopic
$T_{\rm eff}$. We provide evolutionary state, asteroseismic surface gravity,
mass, radius, age, and the spectroscopic and asteroseismic measurements used to
derive them for 12,418 stars. This includes 10,036 exceptionally precise
measurements, with median fractional uncertainties in \nmax, \dnu, mass, radius
and age of 0.6\%, 0.6\%, 3.8\%, 1.8\%, and 11.1\% respectively. We provide more
limited data for 1,624 additional stars which either have lower quality data or
are outside of our primary calibration domain. Using lower red giant branch
(RGB) stars, we find a median age for the chemical thick disk of $9.14 \pm 0.05
({\rm ran}) \pm 0.9 ({\rm sys})$ Gyr with an age dispersion of 1.1 Gyr,
consistent with our error model. We calibrate our red clump (RC) mass loss to
derive an age consistent with the lower RGB and provide asymptotic GB and RGB
ages for luminous stars. We also find a sharp upper age boundary in the
chemical thin disk. We find that scaling relations are precise and accurate on
the lower RGB and RC, but they become more model dependent for more luminous
giants and break down at the tip of the RGB. We recommend the usage of multiple
methods, calibration to a fundamental scale, and the usage of stellar models to
interpret frequency spacings. |
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DOI: | 10.48550/arxiv.2410.00102 |