The K2 Galactic Archaeology Program Data Release 2: Asteroseismic results from campaigns 4, 6, & 7
Joel C. Zinn, Dennis Stello, Yvonne Elsworth, Rafael A. Garc\'ia,, Thomas Kallinger, Savita Mathur, Beno\^it Mosser, Lisa Bugnet, Caitlin Jones,, Marc Hon, Sanjib Sharma, Ralph Sch\"onrich, Jack T. Warfield, Rodrigo Luger,, Marc H. Pinsonneault, Jennifer A. Johnson, Daniel Huber

TL;DR
This paper presents the second data release of asteroseismic parameters for red giants from the K2 Galactic Archaeology Program, providing precise stellar radii and masses across a wide Galactic range to improve Galactic structure models.
Contribution
It introduces a comprehensive set of asteroseismic parameters, evolutionary classifications, and stellar coefficients for a large sample of red giants, expanding the spatial coverage beyond previous missions.
Findings
Reported 4395 stellar radius and mass coefficients with low uncertainties.
Validated asteroseismic radii against Gaia parallaxes with ~2% accuracy.
Sample is nearly complete, with minor gaps at low $ u_{max}$ values.
Abstract
Studies of Galactic structure and evolution have benefitted enormously from Gaia kinematic information, though additional, intrinsic stellar parameters like age are required to best constrain Galactic models. Asteroseismology is the most precise method of providing such information for field star populations , but existing samples for the most part have been limited to a few narrow fields of view by the CoRoT and Kepler missions. In an effort to provide well-characterized stellar parameters across a wide range in Galactic position, we present the second data release of red giant asteroseismic parameters for the K2 Galactic Archaeology Program (GAP). We provide and based on six independent pipeline analyses; first-ascent red giant branch (RGB) and red clump (RC) evolutionary state classifications from machine learning; and ready-to-use…
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