The First APOKASC Catalog of Kepler Dwarf and Subgiant Stars
2017
(
Abridged) We present the first APOKASC catalog of spectroscopic and asteroseismic data for 415 dwarfs and
subgiants. Asteroseismic data have been obtained by
Keplerin short cadence. The spectroscopic parameters are based on spectra taken as part of APOGEE and correspond to DR13 of SDSS. We analyze our data using two 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 Teff, and find that they can lead to significant differences in the derived
stellarproperties. Determinations of
surface gravity($\log{g}$), mean density ($\rho$), radius ($R$), mass ($M$), and age ($\tau$) for the whole sample have been carried out with
stellargrid-based modeling. We have assessed random and systematic error sources in the spectroscopic and seismic data, as well as in the grid-based modeling determination of the
stellarquantities in the catalog. We provide
stellarproperties for both Teff scales. The median combined (random and systematic) uncertainties are 2% (0.01 dex; $\log{g}$), 3.4% ($\rho$), 2.6% ($R$), 5.1% ($M$), and 19% ($\tau$) for the photometric Teff scale and 2% ($\log{g}$), 3.5% ($\rho$), 2.7% ($R$), 6.3% ($M$), and 23% ($\tau$) for the spectroscopic scale. Comparisons with
stellarquantities in the catalog by Chaplin et al.(2014) highlight the importance of metallicity measurements for determining
stellarparameters accurately. We compare our results with those from other sources, including
stellarradii determined from TGAS
parallaxesand asteroseismic analyses based on individual frequencies. We find a very good agreement in all cases. Comparisons give strong support to the determination of
stellarquantities based on global seismology, a relevant result for future missions such as TESS and PLATO. Table 5 corrected (wrongly listed SDSS Teff before).
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