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We demonstrate the ability to measure precise stellar barycentric radialvelocities with the dispersed fixed-delay interferometer technique using theExoplanet Tracker (ET), an instrument primarily designed for precisiondifferential Doppler velocity measurements using this technique. Ourbarycentric radial velocities, derived from observations taken at the KPNO 2.1meter telescope, differ from those of Nidever et al. by 0.047 km/s (rms) whensimultaneous iodine calibration is used, and by 0.120 km/s (rms) withoutsimultaneous iodine calibration. Our results effectively show that a Michelsoninterferometer coupled to a spectrograph allows precise measurements ofbarycentric radial velocities even at a modest spectral resolution of R ~ 5100.A multi-object version of the ET instrument capable of observing ~500 stars pernight is being used at the Sloan 2.5 m telescope at Apache Point Observatoryfor the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS),a wide-field radial velocity survey for extrasolar planets around TYCHO-2 starsin the magnitude range 7.6<V<12. In addition to precise differentialvelocities, this survey will also yield precise barycentric radial velocitiesfor many thousands of stars using the data analysis techniques reported here.Such a large kinematic survey at high velocity precision will be useful inidentifying the signature of accretion events in the Milky Way andunderstanding local stellar kinematics in addition to discovering exoplanets,brown dwarfs and spectroscopic binaries.

Measuring Stellar Radial Velocities with a Dispersed Fixed-Delay Interferometer