NOAO >   Observing Info >   Approved Programs >   2014A-0146

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Proposal Information for 2014A-0146


PI: Fabienne A. Bastien, Vanderbilt University, fabienne.a.bastien@vanderbilt.edu
Address: Department of Physics and Astronomy, VU Station B 1807, Nashville, TN 37206, United States

CoI: Keivan G. Stassun, Vanderbilt University
CoI: Joshua Pepper, Lehigh 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. This project was previously awarded 4 nights, but 2 of them were lost to bad weather. We therefore request additional time to complete the proposed project.


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NOAO >   Observing Info >   Approved Programs >   2014A-0146

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