The Second APOKASC Catalog: The Empirical Approach

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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 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.

Detaljer

Författare
  • Marc H. Pinsonneault
  • Yvonne P. Elsworth
  • Jamie Tayar
  • Aldo Serenelli
  • Dennis Stello
  • Joel Zinn
  • Savita Mathur
  • Rafael A. Garcia
  • Jennifer A. Johnson
  • Saskia Hekker
  • Daniel Huber
  • Thomas Kallinger
  • Szabolcs Mészáros
  • Benoit Mosser
  • Keivan Stassun
  • Léo Girardi
  • Thaise S. Rodrigues
  • Victor Silva Aguirre
  • Deokkeun An
  • Sarbani Basu
  • Och 16 andra
  • William J. Chaplin
  • Enrico Corsaro
  • Katia Cunha
  • D. A. Garcia-Hernández
  • Jon Holtzman
  • Henrik Jönsson
  • Matthew Shetrone
  • Verne V. Smith
  • Jennifer S. Sobeck
  • Guy S. Stringfellow
  • Olga Zamora
  • Timothy C. Beers
  • J. G. Fernández-Trincado
  • Peter M. Frinchaboy
  • Fred R. Hearty
  • Christian Nitschelm
Enheter & grupper
Externa organisationer
  • Ohio State University
  • University of Birmingham
  • Aarhus University
  • Autonomous University of Barcelona
  • University of New South Wales
  • Instituto de Astrofísica de Canarias
  • University of La Laguna (ULL)
  • Space Science Institute
  • Paris Diderot University
  • University of Paris-Saclay
  • Max Planck Institute for Solar System Research
  • University of Hawaii at Manoa
  • University of Vienna
  • Eötvös Loránd University
  • Vanderbilt University
  • INAF - Osservatorio Astronomico di Padova
  • Ewha Womans University
  • Yale University
  • Osservatorio Astrofisico di Catania
  • University of Arizona
  • National Observatory Brazil
  • New Mexico State University
  • University of Texas at Austin
  • National Optical Astronomy Observatory
  • University of Washington
  • University of Colorado
  • University of Notre Dame
  • University of Concepción
  • University of Burgundy - Franche-Comté
  • Texas Christian University
  • Pennsylvania State University
  • Pierre and Marie Curie University
  • University of Antofagasta
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi

Nyckelord

Originalspråkengelska
Artikelnummer32
TidskriftAstrophysical Journal, Supplement Series
Volym239
Utgåva nummer2
StatusPublished - 2018 sep
PublikationskategoriForskning
Peer review utfördJa