We aim to characterize high-velocity ( HiVel ) stars in the solar vicinity both chemically and kinematically using the fourth data release of the RAdial Velocity Experiment ( RAVE ) .
We used a sample of 57 HiVel stars with Galactic rest-frame velocities larger than 275 km s ^ { -1 } .
With 6D position and velocity information , we integrated the orbits of the HiVel stars and found that , on average , they reach out to 13 kpc from the Galactic plane and have relatively eccentric orbits consistent with the Galactic halo .
Using the stellar parameters and [ \alpha /Fe ] estimates from RAVE , we found the metallicity distribution of the HiVel stars peak at [ M/H ] = –1.2 dex and is chemically consistent with the inner halo .
There are a few notable exceptions that include a hypervelocity star ( HVS ) candidate , an extremely high-velocity bound halo star , and one star that is kinematically consistent with the halo but chemically consistent with the disk .
High-resolution spectra were obtained for the metal-rich HiVel star candidate and the second highest velocity star in the sample .
Using these high-resolution data , we report the discovery of a metal-rich halo star that has likely been dynamically ejected into the halo from the Galactic thick disk .
This discovery could aid in explaining the assembly of the most metal-rich component of the Galactic halo .