Spectral analyses of 16 DAO white dwarfs from the Sloan Digital Sky   Survey
  We present a spectral analysis of 16 DAO white dwarfs from the Sloan Digital Sky Survey Data Release 4. With our NLTE H+He model grid, we derived photospheric parameters for these objects. We compare our new results to literature values and divide the DAOs into two distinct groups: post-AGB and EHB progenitors. 
S. D. Huegelmeyer (1), S. Dreizler (1), T. Rauch (2), and J.   Krzesinski (3) ((1) Institut fuer Astrophysik, Goettingen, Ge...