NOAO >   Observing Info >   Approved Programs >   2015A-0202

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Program Information for 2015A-0202


PI: Fabienne A Bastien, Pennsylvania State U., fxb21@psu.edu
Address: Astronomy Department, 525 Davey Lab, University Park, PA 16802 United States

CoI: Keivan G Stassun, Vanderbilt U.
CoI: William Chaplin, University of Birmingham
CoI: Daniel Huber, U. of Sydney

Title: Correlating Photometric Variability and Chromospheric Activity in Kepler Stars

Abstract: The variety of photometric variations due to the magnetic activity of Sun-like stars, as revealed by {\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 appearing ``inactive'' by traditional measures may be highly variable in radial-velocity and/or exhibit complex photometric variations. Our results, along with recent modeling efforts, suggest promising observational predictors of this behavior. We propose to measure the activity of $\sim0 stars in the {\it Kepler} field, primarily 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 refine models that seek to predict photometric and radial-velocity variations of potential planet-hosting stars. This project was previously awarded 5 nights, but 4 were lost to bad weather and instrument problems. We therefore request additional time to complete this project.

Program Type: Standard/Galactic

Scheduled Nights:
Run 2 (2015A):  WIYN/HYDR -- 2n on Jun 30 - Jul 01 2015
Run 3 (2015A):  WIYN/HYDR -- 3n on Jul 24 - Jul 26 2015


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NOAO >   Observing Info >   Approved Programs >   2015A-0202

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