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We aim to characterize high-velocity (HiVel) stars in the solar vicinity bothchemically and kinematically using the fourth data release of the RAdialVelocity Experiment (RAVE). We used a sample of 57 HiVel stars with Galacticrest-frame velocities larger than 275 km s$^{-1}$. With 6D position andvelocity information, we integrated the orbits of the HiVel stars and foundthat, on average, they reach out to 13 kpc from the Galactic plane and haverelatively eccentric orbits consistent with the Galactic halo. Using thestellar parameters and [$\alpha$/Fe] estimates from RAVE, we found themetallicity distribution of the HiVel stars peak at [M/H] = -1.2 dex and ischemically consistent with the inner halo. There are a few notable exceptionsthat include a hypervelocity star (HVS) candidate, an extremely high-velocitybound halo star, and one star that is kinematically consistent with the halobut chemically consistent with the disk. High-resolution spectra were obtainedfor the metal-rich HiVel star candidate and the second highest velocity star inthe sample. Using these high-resolution data, we report the discovery of ametal-rich halo star that has likely been dynamically ejected into the halofrom the Galactic thick disk. This discovery could aid in explaining theassembly of the most metal-rich component of the Galactic halo.

Characterizing the High-Velocity Stars of RAVE: The Discovery of a Metal-Rich Halo Star Born in the Galactic Disk