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The Second APOKASC Catalog : The Empirical Approach

Pinsonneault, Marc H.; Elsworth, Yvonne P.; Tayar, Jamie; Serenelli, Aldo; Stello, Dennis; Zinn, Joel; Mathur, Savita; Garcia, Rafael A.; Johnson, Jennifer A. and Hekker, Saskia, et al. (2018) In Astrophysical Journal, Supplement Series 239(2).
Abstract

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... (More)

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 (ν 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 red clump stars.

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published
subject
keywords
stars: abundances, stars: fundamental parameters, stars: oscillations (including pulsations)
in
Astrophysical Journal, Supplement Series
volume
239
issue
2
publisher
University of Chicago Press
external identifiers
  • scopus:85059131774
ISSN
0067-0049
DOI
10.3847/1538-4365/aaebfd
language
English
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yes
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6fa8d320-2946-4e57-b1c6-553c4ec70f21
alternative location
https://arxiv.org/pdf/1804.09983.pdf
date added to LUP
2019-01-16 09:14:57
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2019-06-25 03:48:24
@article{6fa8d320-2946-4e57-b1c6-553c4ec70f21,
  abstract     = {<p>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 (ν <sub>max</sub>) 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.</p>},
  articleno    = {32},
  author       = {Pinsonneault, Marc H. and Elsworth, Yvonne P. and Tayar, Jamie and Serenelli, Aldo and Stello, Dennis and Zinn, Joel and Mathur, Savita and Garcia, Rafael A. and Johnson, Jennifer A. and Hekker, Saskia and Huber, Daniel and Kallinger, Thomas and Mészáros, Szabolcs and Mosser, Benoit and Stassun, Keivan and Girardi, Léo and Rodrigues, Thaise S. and Aguirre, Victor Silva and An, Deokkeun and Basu, Sarbani and Chaplin, William J. and Corsaro, Enrico and Cunha, Katia and Garcia-Hernández, D. A. and Holtzman, Jon and Jönsson, Henrik and Shetrone, Matthew and Smith, Verne V. and Sobeck, Jennifer S. and Stringfellow, Guy S. and Zamora, Olga and Beers, Timothy C. and Fernández-Trincado, J. G. and Frinchaboy, Peter M. and Hearty, Fred R. and Nitschelm, Christian},
  issn         = {0067-0049},
  keyword      = {stars: abundances,stars: fundamental parameters,stars: oscillations (including pulsations)},
  language     = {eng},
  number       = {2},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal, Supplement Series},
  title        = {The Second APOKASC Catalog : The Empirical Approach},
  url          = {http://dx.doi.org/10.3847/1538-4365/aaebfd},
  volume       = {239},
  year         = {2018},
}