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Table 1
Program stars and finally adopted parameters.
| PG 1707+427 | PG 1424+535 | Suna | |
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| Teff/K | 85 000 | 110 000 | |
| log g | 7.5 | 7.0 | |
| He | 0.52 | 0.52 | 0.25 |
| C | 0.45 | 0.45 | 2.4 × 10-3 |
| N | 0.01 | ≤ 3.5 × 10-5 | 6.9 × 10-4 |
| O | 0.03 | 0.03 | 5.7 × 10-3 |
| F | 1.0 × 10-4 | 5.0 × 10-5 | 5.0 × 10-7 |
| Ne | − | 1.0 × 10-2 | 1.3 × 10-3 |
| Na | − | − | 2.9 × 10-5 |
| Mg | ≤ 5.0 × 10-3 | ≤ 5.0 × 10-3 | 7.1 × 10-4 |
| Al | ≤ 5.0 × 10-3 | ≤ 5.0 × 10-4 | 5.6 × 10-5 |
| Si | 3.2 × 10-4 | 2.0 × 10-4 | 6.6 × 10-4 |
| P | 1.0 × 10-5 | 3.2 × 10-5 | 5.8 × 10-6 |
| S | 3.2 × 10-4 | 1.0 × 10-4 | 3.1 × 10-4 |
| Ar | − | 6.0 × 10-5 | 7.3 × 10-5 |
| Ca | − | − | 6.4 × 10-5 |
| Sc | − | − | 4.6 × 10-8 |
| Ti | ≤ 3.1 × 10-3 | − | 3.1 × 10-6 |
| V | ≤ 3.2 × 10-5 | ≤ 3.2 × 10-4 | 3.2 × 10-7 |
| Cr | ≤ 1.7 × 10-5 | ≤ 1.7 × 10-4 | 1.7 × 10-5 |
| Mn | ≤ 1.1 × 10-4 | ≤ 1.1 × 10-4 | 1.1 × 10-5 |
| Fe | ≤ 1.3 × 10-3 | 1.3 × 10-3 | 1.3 × 10-3 |
| Co | ≤ 4.2 × 10-4 | ≤ 4.2 × 10-4 | 4.2 × 10-6 |
| Ni | ≤ 7.1 × 10-5 | ≤ 2.0 × 10-4 | 7.1 × 10-5 |
| Zn | ≤ 5.0 × 10-6 | ≤ 5.0 × 10-6 | 1.7 × 10-6 |
| Ga | ≤ 5.6 × 10-5 | ≤ 1.0 × 10-5 | 5.6 × 10-8 |
| Ge | ≤ 2.4 × 10-5 | ≤ 1.0 × 10-5 | 2.4 × 10-7 |
| Kr | ≤ 4.0 × 10-4 | ≤ 2.0 × 10-5 | 1.1 × 10-7 |
| Xe | ≤ 1.0 × 10-5 | ≤ 2.0 × 10-6 | 1.7 × 10-8 |
| Ba | ≤ 1.5 × 10-3 | ≤ 1.5 × 10-3 | 1.5 × 10-8 |
Notes. Abundances in mass fractions and surface gravity g in cm s-2. If no abundance value is given, then no meaningful upper limit could be determined.
(a)
Solar abundances from Asplund et al. (2009).
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