Identification of Globular Cluster Stars in RAVE data I: Application to
  Stellar Parameter Calibration
  We present the identification of potential members of nearby Galactic
globular clusters using radial velocities from the RAdial Velocity Experiment
Data Release 4 (RAVE-DR4) survey database. Our identifications are based on
three globular clusters -- NGC 3201, NGC 5139 ($\omega$ Cen) and NGC 362 -- all
of which are shown to have |RV|>100 km/s. The identification of globular
cluster stars in RAVE DR4 data offers a unique opportunity to test the
precision and accuracy of the stellar parameters determined with the currently
available Stellar Parameter Pipelines (SPPs) used in the survey, as globular
clusters are ideal testbeds for the validation of stellar atmospheric
parameters, abundances, distances and ages. For both NGC 3201 and $\omega$ Cen,
there is compelling evidence for numerous members (> 10) in the RAVE database;
in the case of NGC 362 the evidence is more ambiguous, and there may be
significant foreground and/or background contamination in our
kinematically-selected sample. A comparison of the RAVE-derived stellar
parameters and abundances with published values for each cluster and with BASTI
isochrones for ages and metallicities from the literature reveals overall good
agreement, with the exception of the apparent underestimation of surface
gravities for giants, in particular for the most metal-poor stars. Moreover, if
the selected members are part of the main body of each cluster our results
would also suggest that the distances from Binney et al. 2013, where only
isochrones more metal-rich than -0.9 dex were used, are typically
underestimated by ~ 40% with respect to the published distances for the
clusters, while the distances from Zwitter et al. 2010 show stars ranging from
1 to ~ 6.5 kpc -- with indications of a trend toward higher distances at lower
metallicities -- for the three clusters analysed in this study.
