Table 1: Derived $M_{\rm H}/M_{\rm WD}$ in ZZ Ceti stars.
Object Number of modes $M_{\rm H}\times 10^{-4}~M_{\rm WD}$ Ref.
G 226-29 3 $\approx$1.0 1
L 19-2 11 $\approx$1.0 2
R 548 7 1.5 3
GD 165 8 $\approx$2.0 4
G 29-38 19 0.005 5
G 117-B15A 3 $\approx$1.0 6
GD 154 3 $2\times 10^{-6}$ 7
BPM 37093 8 0.02-0.6 8
Notes: The number of modes is obtained after subtracting the linear combinations and harmonics from the power spectra. Its does include multiplet components induced by rotational splitting (except in the case of G 29-38 where the indicated number is the total number of multiplets). This number is the sum of all the modes observed during various observing seasons. References: 1) Kepler et al. (1995); 2) Bradley (1993, 2001); 3) Bradley (1998); 4) Bergeron et al. (1993), Bradley (2001); 5) Kleinman et al. (1998); 6) Robinson et al. (1995), Bradley (1998); 7) Pfeiffer et al. (1996); 8) Kanaan et al. (2005), Metcalfe et al. (2004), but see also Fontaine & Brassard (2004).

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