Ground-Based BVRI Follow-Up Observations of the Cepheid V1154 Cyg in   Kepler's Field
  The almost un-interrupted observations from Kepler Space Telescope can be used to search for Earth-size and larger planets around other stars, as well as for stellar variability and asteroseismological study. However, the Kepler's observations are carried out with a single broad-band filter, and ground-based follow-up observations are needed to complement Kepler's light curves to fully characterize the properties of the target stars. Here we present ground-based optical (BVRI) followup observations of V1154 Cyg, the only Cepheid in the Kepler field of view, and deriving basic properties of this star. 
C.-C. Ngeow, R. Szabo, L. Szabados, A. Henden, M. A. T. Groenewegen,   the Kepler Cepheid Working Group
astro-ph.SR