The APO-K2 Catalog. I. ∼7500 Red Giants with Fundamental Stellar Parameters from APOGEE DR17 Spectroscopy and K2-GAP Asteroseismology

The APO-K2 Catalog. I. ∼7500 Red Giants with Fundamental Stellar Parameters from APOGEE DR17 Spectroscopy and K2-GAP Asteroseismology

Abstract We present a catalog of fundamental stellar properties for ∼7500 evolved stars, including stellar radii and masses, determined from the combination of spectroscopic observations from the Apache Point Observatory Galactic Evolution Experiment, part of the Sloan Digital Sky Survey IV, and ast...

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Bibliographic Details
Published in:The Astronomical journal 2024-02, Vol.167 (2), p.50
Main Authors: Schonhut-Stasik, Jessica, Zinn, Joel C., Stassun, Keivan G., Pinsonneault, Marc, Johnson, Jennifer A., Warfield, Jack T., Stello, Dennis, Elsworth, Yvonne, García, Rafael A., Mathur, Savita, Mosser, Benoit, Hon, Marc, Tayar, Jamie, Stringfellow, Guy S., Beaton, Rachael L., Jönsson, Henrik, Minniti, Dante
Format: Article
Language:eng
Subjects:
Apogees
Archaeology
Asteroseismology
Enceladus
Galactic archaeology
Galactic evolution
Kinematics
Metallicity
Parameters
Red giant stars
Sky surveys (astronomy)
Spectroscopic observation
Spectroscopy
Stars
Stellar astronomy
Stellar evolution
Stellar kinematics
Stellar mass
Stellar seismology
Temperature scales
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Summary:Abstract We present a catalog of fundamental stellar properties for ∼7500 evolved stars, including stellar radii and masses, determined from the combination of spectroscopic observations from the Apache Point Observatory Galactic Evolution Experiment, part of the Sloan Digital Sky Survey IV, and asteroseismology from K2. The resulting APO-K2 catalog provides spectroscopically derived temperatures and metallicities, asteroseismic global parameters, evolutionary states, and asteroseismically derived masses and radii. Additionally, we include kinematic information from Gaia. We investigate the multidimensional space of abundance, stellar mass, and velocity with an eye toward applications in Galactic archaeology. The APO-K2 sample has a large population of low-metallicity stars (∼288 with [M/H] ≤ −1), and their asteroseismic masses are larger than astrophysical estimates. We argue that this may reflect offsets in the adopted fundamental temperature scale for metal-poor stars rather than metallicity-dependent issues with interpreting asteroseismic data. We characterize the kinematic properties of the population as a function of α enhancement and position in the disk and identify those stars in the sample that are candidate components of the Gaia-Enceladus merger. Importantly, we characterize the selection function for the APO-K2 sample as a function of metallicity, radius, mass, ν max , color, and magnitude referencing Galactic simulations and target selection criteria to enable robust statistical inferences with the catalog.
ISSN:0004-6256
1538-3881
1538-3881