PI: Fabienne A. Bastien, Vanderbilt University, firstname.lastname@example.org
Address: Department of Physics and Astronomy, VU Station B 1807, Nashville, TN 37206, United States
CoI: Keivan G. Stassun, Vanderbilt University
CoI: Joshua Pepper, Vanderbilt University
CoI: William Chaplin, University of Birmingham
CoI: Daniel Huber, NASA Ames Research Center
Title: Correlating Photometric Variability and Chromospheric Activity in Kepler Stars
Abstract: The panoply of photometric variability due to the magnetic activity of Sun-like stars, as revealed by missions like \it Kepler, has significantly impacted our understanding of stars, calling for a thorough characterization of this behavior, an important noise source in planet detection. Our work, based on previous WIYN/Hydra observations of \it Kepler stars, reveals that many stars that appear ``inactive'' by traditional measures may be highly variable in radial-velocity and/or exhibit complex photometric variations. Our preliminary results, along with recent modeling efforts, suggest promising and testable observational predictors of this behavior. We propose to measure the magnetic activity of ~280 stars in the \it Kepler field, including asteroseismic targets with precisely determined parameters, via their Ca II H&K emission, over a relatively long time-baseline, in order to link activity and its degree of variation to photometric variability. We will also use these data to test and refine models that seek to predict photometric and radial-velocity variations of potential planet-hosting stars. This analysis will inform theories of the causes of stellar activity and improve the efficiency of planet detection.