NOAO >   Observing Info >   Approved Programs >   2013A-0290

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Proposal Information for 2013A-0290


PI: Rachel A. Matson, Georgia State University, rmatson@chara.gsu.edu
Address: Physics Department, P.O. Box 4106, Atlanta, GA 30302-4106, USA

CoI: Douglas R. Gies, Georgia State University
CoI: Stephen J. Williams, Georgia State University
CoI: Zhao Guo, Georgia State University

Title: Spectroscopic Orbits for Kepler FOV Eclipsing Binaries

Abstract: We are currently involved in a four year program of precise eclipsing binary photometry with the NASA Kepler Observatory. 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. The goal of this proposal is to obtain blue spectra of short period (0.9-6d) eclipsing binaries, derive radial velocities, and produce a double-lined spectroscopic orbit (as well as 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, which will yield the mass-inclination product M_3 \sin i for any companions detected by light travel time or other effects. An extended sample of eclipsing binaries with longer periods (up to 50d) is now being investigated to test whether the presence of a tertiary companion declines with increasing period. We propose to obtain a single spectrum at quadrature for the brightest 48 stars in this expanded sample to characterize the effective temperatures and total mass contained in these systems.


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NOAO >   Observing Info >   Approved Programs >   2013A-0290

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