The Teff − log g diagram showing our low-mass He-core white dwarf evolutionary tracks (black thin lines). Bold numbers correspond to the stellar mass of each sequence. The different symbols with error bars represent the location of the low-mass white dwarfs known to date. We include field objects as well as stars found in the open cluster NGC 6791 to have a general overview of the observational status of these stars. The location of the first known pulsating ELM white dwarf (Teff = 9100 ± 170 K, log g = 6.22 ± 0.06; Hermes et al. 2012) is displayed with a small circle (magenta). As reference, we also depict the C/O-core white dwarf evolutionary tracks (gray thick lines) for masses between 0.525 and 0.935 M⊙ (Romero et al. 2012) and the location of the known ZZ Ceti (DAV) stars.
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