The Rich Are Different: Evidence from the RAVE Survey for Stellar Radial
  Migration
  Using the RAdial Velocity Experiment fourth data release (RAVE DR4), and a
new metallicity calibration that will be also taken into account in the future
RAVE DR5, we investigate the existence and the properties of super-solar
metallicity stars ([M/H] > +0.1 dex) in the sample, and in particular in the
Solar neighbourhood. We find that RAVE is rich in super-solar metallicity
stars, and that the local metallicity distribution function declines remarkably
slowly up to +0.4 dex. Our results show that the kinematics and height
distributions of the super-solar metallicity stars are identical to those of
the [M/H] < 0 thin-disc giants that we presume were locally manufactured. The
eccentricities of the super-solar metallicity stars indicate that half of them
are on a roughly circular orbit (e < 0.15), so under the assumption that the
metallicity of the interstellar medium at a given radius never decreases with
time, they must have increased their angular momenta by scattering at
corotation resonances of spiral arms from regions far inside the Solar annulus.
The likelihood that a star will migrate radially does not seem to decrease
significantly with increasing amplitude of vertical oscillations within range
of oscillation amplitudes encountered in the disc.
