The First APOKASC Catalog of Kepler Dwarf and Subgiant Stars

Research output: Contribution to journalArticlepeer-review

Authors

  • Aldo Serenelli
  • Jennifer Johnson
  • Daniel Huber
  • Marc Pinsonneault
  • Jamie Tayar
  • Victor Silva Aguirre
  • Sarbani Basu
  • Nicholas Troup
  • Saskia Hekker
  • Thomas Kallinger
  • Dennis Stello
  • Savita Mathur
  • Benoit Mosser
  • Keivan G. Stassun
  • Rafael A. García
  • Rasmus Handberg
  • Jon Holtzman
  • Fred Hearty
  • D. A. García-Hernández
  • Patrick Gaulme
  • Olga Zamora

Colleges, School and Institutes

External organisations

  • Universitat Autonoma de Barcelona
  • Ohio State University
  • University of Hawaii
  • University of Technology Sydney
  • SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
  • Aarhus Universitet
  • Georg August Universitaet
  • Max-Planck-Institut für Sonnensystemforschung
  • Yale University
  • University of Virginia
  • University of Vienna
  • University of New South Wales
  • Space Science Institute
  • CNRS-CEA
  • Vanderbilt University
  • Physics Department, Fisk University
  • Paris-Saclay University
  • CEA
  • New Mexico State University Las Cruces
  • Pennsylvania State University
  • Instituto de Astrofísica de Canarias (IAC)
  • Universidad de La Laguna
  • Apache Point Observatory

Abstract

We present the first APOKASC catalog of spectroscopic and asteroseismic data for dwarfs and subgiants. Asteroseismic data for our sample of 415 objects have been obtained by the Kepler mission in short (58.5 s) cadence, and light curves span from 30 up to more than 1000 days. The spectroscopic parameters are based on spectra taken as part of the Apache Point Observatory Galactic Evolution Experiment and correspond to Data Release 13 of the Sloan Digital Sky Survey. We analyze our data using two independent Teff scales, the spectroscopic values from DR13 and those derived from SDSS griz photometry. We use the differences in our results arising from these choices as a test of systematic temperature uncertainties and find that they can lead to significant differences in the derived stellar properties. Determinations of surface gravity (log g), mean density (〈 ρ 〉), radius (R), mass (M), and age (τ) for the whole sample have been carried out by means of (stellar) grid-based modeling. We have thoroughly assessed random and systematic error sources in the spectroscopic and asteroseismic data, as well as in the grid-based modeling determination of the stellar quantities provided in the catalog. We provide stellar properties determined for each of the two Teff scales. The median combined (random and systematic) uncertainties are 2% (0.01 dex; log g), 3.4% (〈 ρ 〉), 2.6% (R), 5.1% (M), and 19% (τ) for the photometric Teff scale and 2% (log g), 3.5% (〈 ρ 〉), 2.7% (R), 6.3% (M), and 23% (τ) for the spectroscopic scale. We present comparisons with stellar quantities in the asteroseismic catalog by Chaplin et al. that highlight the importance of having metallicity measurements for determining stellar parameters accurately. Finally, we compare our results with those coming from a variety of sources, including stellar radii determined from TGAS parallaxes and asteroseismic analyses based on individual frequencies. We find a very good agreement for all inferred quantities. The latter comparison, in particular, gives strong support to the determination of stellar quantities based on global seismology, a relevant result for future missions such as TESS and PLATO.

Details

Original languageEnglish
Article number23
JournalAstrophysical Journal, Supplement Series
Volume233
Issue number2
Publication statusPublished - 8 Dec 2017

Keywords

  • asteroseismology, catalogs, stars: fundamental parameters, surveys