Fig. 3
Positions of H1504+65 and RX J0439.8−6809 in the g-Teff diagram. Also shown are the locations of PG 1159 stars (squares) and DO WDs (circles). The apparent clustering of stars at Δlog g= 0.5 steps is the consequence of employed model grids and analysis techniques that have typical errors of 0.5 dex (see, e.g., Werner & Herwig 2006). Evolutionary tracks by Althaus et al. (2009b) are labeled with the stellar mass in solar units.
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