NOAO >   Observing Info >   Approved Programs >   2012A-0132

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Proposal Information for 2012A-0132


PI: Stephen J. Williams, Georgia State University, swilliams@chara.gsu.edu
Address: Physics Department, P.O. Box 4106, Atlanta, GA 30302-4106, USA

CoI: Douglas R. Gies, Georgia State University
CoI: Rachel A. Matson, Georgia State University
CoI: Zhao Guo, Georgia State University

Title: Spectroscopic Orbits for Kepler FOV Eclipsing Binaries

Abstract: A three year program of precise eclipsing binary photometry with the NASA \it Kepler Observatory is now in progress. Our goal is to search for variations in minimum light timing for intermediate mass eclipsing binaries. Such periodic variations will reveal the reflex motion caused by any distant, low mass object that orbits the close binary. \it Kepler's unprecedented accuracy and continuous observations provide a unique opportunity to detect the low mass companions that are predicted to result from the angular momentum of the natal cloud. We need to determine the masses of the central binary to help estimate the companion mass. The goal of this proposal is to obtain blue spectra of these targets, derive radial velocities, and produce a double-lined spectroscopic orbit (plus estimates of the stellar effective temperatures, gravities, and metallicities). Combined with the \it Kepler light curve, we will determine very accurate masses and radii for the members of the close binary, and this will yield the mass - inclination product M_3 \sin i for any companions detected by light travel time or other effects.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2012A-0132

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