Using the 2dF multi-fibre instrument at the AAT, we have carried out a
spectroscopic survey of over 1500 stars brighter than
B=16.6 mag, which have been confirmed by the proper
motion study of van Leeuwen et al. (2000) to be
members of the massive galactic globular cluster,
omega Centauri. The survey aimed at sampling the
Hertzsprung-Russell Diagram in a uniform way, thus
avoiding a bias towards the dominant stellar
population and allowing the study of stars with less
common properties such as particularly metal-rich or
metal-poor stars. Exceptionally, though, emphasis has
been given to include as many RR Lyrae variables as
possible in order to address the question why these
variables are distributed over such a wide observed
range in colours --- coinciding with many non-variable
stars of similar colours. The potential of the data
and analysis are presented together with the first
preliminary results.