Table 1: Atmospheric parameters of the program stars as taken from the literature. The neon abundance has been set to 2%. Abundances are given in % mass fraction.

Object		 $T_{\rm eff}$ $\log g$ H He C O Ref.
  [kK] (cgs)          

RX J0122.9-7521		 180 7.5   66 21 11 A
RX J2117.1+3412 170 6.0   38 54 6 B
PG 1520+525 150 7.5   43 38 17 J
PG 1144+005 150 6.5   38 58 2 C
NGC 246 150 5.7   62 30 6 F
PG 1159-035 140 7.0   33 48 17 I,J
Abell 21 140 6.5   33 48 17 F
K1-16 140 6.4   33 48 17 G
Longmore 3 140 6.3   38 54 6 F
PG 1151-029 140 6.0   33 48 17 F
Longmore 4 120 5.5   45 42 11 D
PG 1424+535 110 7.0   49 43 6 J
Abell 43 110 5.7 35 41 21 1 E
NGC 7094 110 5.7 35 41 21 1 E
Abell 30 110 5.5   33 48 17 H
MCT0130-1937 90 7.5   73 22 3 J
PG 1707+427 85 7.5   43 38 17 J
References in last column: A: Werner et al. (1996a); B: Werner et al. (1996b); C: Werner & Heber (1991); D: Werner et al. (1992); E: Dreizler et al. (1997); F: Rauch & Werner (1997); G: Kruk & Werner (1998); H: Werner et al. (2003a); I: Werner et al. (1991); J: Dreizler & Heber (1998).

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