  AA Dor is an eclipsing, close, post common-envelope binary (PCEB) consisting
of a sdOB primary star and an unseen cool companion with an extraordinary low
mass.
  The evolution of this system appears enigmatic - results of a recent spectral
analysis of the primary has shown that the secondary is formally a brown dwarf.
  We present results of a spectral analysis which is based on phase-resolved
high-resolution and high-SN spectroscopy.
