  (Abridged) We present the first APOKASC catalog of spectroscopic and
asteroseismic data for 415 dwarfs and subgiants. Asteroseismic data have been
obtained by Kepler in 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 stellar properties.
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 stellar grid-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 stellar quantities in the catalog. We provide
stellar properties 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 stellar quantities in the catalog by
Chaplin et al.(2014) highlight the importance of metallicity measurements for
determining stellar parameters accurately. We compare our results with those
from other sources, including stellar radii determined from TGAS parallaxes and
asteroseismic analyses based on individual frequencies. We find a very good
agreement in all cases. Comparisons give strong support to the determination of
stellar quantities based on global seismology, a relevant result for future
missions such as TESS and PLATO. Table 5 corrected (wrongly listed SDSS Teff
before).
