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We have designed and constructed a second-generation version of the DispersedFourier Transform Spectrograph, or dFTS. This instrument combines a spectralinterferometer with a dispersive spectrograph to provide high-accuracy,high-resolution optical spectra of stellar targets. The new version, dFTS2, isbased upon the design of our prototype, with several modifications to improvethe system throughput and performance. We deployed dFTS2 to the StewardObservatory 2.3-meter Bok Telescope from June 2007 to June 2008, and undertookan observing program on spectroscopic binary stars, with the goal ofconstraining the velocity amplitude K of the binary orbits with 0.1% accuracy,a significant improvement over most of the orbits reported in the literature.We present results for radial velocity reference stars and orbit solutions forsingle-lined spectroscopic binaries.

Stellar Astrophysics with a Dispersed Fourier Transform Spectrograph. I. Instrument Description and Orbits of Single-lined Spectroscopic Binaries