TY - JOUR
T1 - The Second APOKASC Catalog
T2 - The Empirical Approach
AU - Pinsonneault, Marc H.
AU - Elsworth, Yvonne P.
AU - Tayar, Jamie
AU - Serenelli, Aldo
AU - Stello, Dennis
AU - Zinn, Joel
AU - Mathur, Savita
AU - García, Rafael A.
AU - Johnson, Jennifer A.
AU - Hekker, Saskia
AU - Huber, Daniel
AU - Kallinger, Thomas
AU - Mészáros, Szabolcs
AU - Mosser, Benoit
AU - Stassun, Keivan
AU - Girardi, Léo
AU - Rodrigues, Thaíse S.
AU - Aguirre, Victor Silva
AU - An, Deokkeun
AU - Basu, Sarbani
AU - Chaplin, William J.
AU - Corsaro, Enrico
AU - Cunha, Katia
AU - García-Hernández, D. A.
AU - Holtzman, Jon
AU - Jönsson, Henrik
AU - Shetrone, Matthew
AU - Smith, Verne V.
AU - Sobeck, Jennifer S.
AU - Stringfellow, Guy S.
AU - Zamora, Olga
AU - Beers, Timothy C.
AU - Fernández-Trincado, J. G.
AU - Frinchaboy, Peter M.
AU - Hearty, Fred R.
AU - Nitschelm, Christian
N1 - 29 pages, 26 figures. Submitted ApJSupp. Comments welcome. For access to the main data table (Table 5) use https://www.dropbox.com/s/k33td8ukefwy5tv/APOKASC2_Table5.txt?dl=0; for access to the individual pipeline values (Table 6) use https://www.dropbox.com/s/vl9s2p3obftrv8m/APOKASC2_Table6.txt?dl=0
PY - 2018/12/10
Y1 - 2018/12/10
N2 - We present a catalog of stellar properties for a large sample of 6676 evolved stars with APOGEE spectroscopic parameters and \textit{Kepler} asteroseismic data analyzed using five independent techniques. Our data includes 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 ($\Delta \nu$) scaling relation, and we calibrate the zero point of the frequency of maximum power ($\nu_{\rm max}$) 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 RC stars.
AB - We present a catalog of stellar properties for a large sample of 6676 evolved stars with APOGEE spectroscopic parameters and \textit{Kepler} asteroseismic data analyzed using five independent techniques. Our data includes 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 ($\Delta \nu$) scaling relation, and we calibrate the zero point of the frequency of maximum power ($\nu_{\rm max}$) 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 RC stars.
KW - astro-ph.SR
U2 - 10.3847/1538-4365/aaebfd
DO - 10.3847/1538-4365/aaebfd
M3 - Article
SN - 0067-0049
VL - 239
JO - Astrophysical Journal. Supplement Series
JF - Astrophysical Journal. Supplement Series
IS - 2
M1 - 32
ER -