Table 1
Programme stars of this work and their parameters.
| Star | Teff /K | log g | C/He | O/He | N/He |
|
|
|||||
| PG 0122+200 | 80 000 | 7.5 | 0.1 | 0.01 | 0.01 |
| MCT 0130−1937 | 90 000 | 7.5 | 0.1 | 0.01 | <10-5 |
| PG 2131+066 | 95 000 | 7.5 | 0.1 | 0.01 | 0.01 |
Notes. All values are from Dreizler & Heber (1998), except for the C and O abundances of PG 0122+200 and PG 2131+066, which were revised downward in the present work (previous values were 0.3 and 0.1, respectively). Abundance ratios are given by number and surface gravity g in cm s-2.
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