Table 1
Final adopted parameters for the program stars PG 1144+005 and PG 1520+525.
| PG 1144+005 | PG 1520+525 | PG 1159−035 | Suna | |
|
|
||||
| Teff / K | 150 000 | 150 000 | 140 000 | |
| log g | 6.5 | 7.5 | 7.0 | |
| H | < 0.10 | < 0.10 | < 0.02 | 0.74 |
| He | 0.38 | 0.43 | 0.33 | 0.25 |
| C | 0.57 | 0.38 | 0.48 | 2.4 × 10-3 |
| N | 0.015 | < 1.5 × 10-4 | 0.001 | 6.9 × 10-4 |
| O | 0.016 | 0.17 | 0.17 | 5.7 × 10-3 |
| F | 1.0 × 10-5 | 1.0 × 10-4 | 3.2 × 10-6 | 5.0 × 10-7 |
| Ne | 0.02 | 0.02 | 0.02 | 0.0013 |
| Na | < 0.01 | – | – | 2.9 × 10-5 |
| Al | < 1.0 × 10-3 | < 3.2 × 10-4 | < 3.2 × 10-4 | 5.6 × 10-5 |
| Si | 6.6 × 10-4 | 6.6 × 10-4 | 3.6 × 10-4 | 6.6 × 10-4 |
| P | < 3.0 × 10-5 | < 3.0 × 10-5 | < 6.4 × 10-6 | 5.8 × 10-6 |
| S | 1.0 × 10-4 | 3.1 × 10-4 | 3.1 × 10-4 | 3.1 × 10-4 |
| Cl | < 1.0 × 10-3 | < 1.0 × 10-3 | < 1.0 × 10-3 | 8.2 × 10-6 |
| Ar | < 8.0 × 10-5 | < 8.0 × 10-5 | < 3.2 × 10-5 | 7.3 × 10-5 |
| Fe | 1.3 × 10-3 | 1.3 × 10-3 | 1.3 × 10-3 | 1.3 × 10-3 |
Notes. The results are compared to the prototype of the PG 1159 spectral class (PG 1159−035) and the Sun. Abundances in mass fractions and surface gravity g in cm s-2. Parameters for PG 1159−035 from Jahn et al. (2007) and references therein, except for the abundances of Fe (from Werner et al. 2011) and Al, S, Cl (this work). Upper limits for H in PG 1144+005, PG 1520+525, and PG 1159−035 from Werner & Heber (1991), Werner et al. (1991, 1996).
Solar abundances from Asplund et al. (2009).
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