Characteristics of 100+ Kepler Asteroseismic Targets from Ground-Based Observations

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We present results of our 5-years-long program of ground-based spectroscopic and photometric observations of individual Kepler asteroseismic targets and the open clusters NGC6866 and NGC6811 from the Kepler field of view.We determined the effective temperature, surface gravity, metallicity, the projected rotational velocity and the radial velocity of 119 Kepler asteroseismic targets for which we acquired high-resolution spectra.

• For many of these stars the derived atmospheric parameters agree with Teff, log g, and [Fe/H] from the Kepler Input Catalog (KIC) to within their error bars.
• Only for stars hotter than 7000K we notice significant differences between the effective temperature derived from spectroscopy and Teff given in the KIC.
• For 19 stars which we observed photoelectrically, we measured the interstellar reddening and we found it to be negligible.