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Table 1
Parameters of the new PG 1159 stars, O(He) stars, and hot DO white dwarfs.
| Name | Spectral | Teff | log g | C/He | M | Remarks |
| SDSS J | type | [kK] | [cm s-2] | [M⊙] | ||
|
|
||||||
| 152116.00+251437.46 | PG 1159 | 140 ± 15 | 6.0 ± 0.3 | 0.17 |
|
hybrid PG1159; H/He = 1, O/He = 0.0043 |
| 075415.12+085232.18 | PG 1159 | 120 ± 10 | 7.0 ± 0.3 | 0.33 |
|
|
| 141556.26+061822.43 | PG 1159 | 120 ± 10 | 7.5 ± 0.3 | 0.11 |
|
|
| 055905.02+633448.45 | PG 1159 | 110 ± 15 | 7.5 ± 0.5 | 0.11 |
|
|
| 105300.24+174932.95 | PG 1159 | 100 ± 10 | 7.0 ± 0.5 | 0.11 |
|
|
| 191845.01+624343.77 | PG 1159 | 100 ± 10 | 7.2 ± 0.3 | 0.11 |
|
|
| 123930.62+244321.75 | PG 1159 | 100 ± 15 | 7.5 ± 0.5 | 0.03 |
|
|
| 172854.34+361958.62 | O(He) | 100 ± 10 | 5.0 ± 0.2 | 0.01 |
|
N/He = 0.0018, O/He = 0.002, Si/He = 0.0015 |
| 171916.97+365326.70 | O(He) | 100 ± 20 | 5.5 ± 0.5 | 0.01 |
|
|
| 141812.50−024426.92 | O(He) | 90 ± 20 | 5.5 ± 0.5 | 0.002 |
|
|
| 075732.18+184329.28 | O(He) | 80 ± 20 | 5.0 ± 0.3 | 0.002 |
|
|
| 151215.72+065156.34 | DO | 120 ± 15 | 7.5 ± 0.3 | 0.01 |
|
unusually strong He ii lines |
| 083610.09+160558.76 | DO | 100 ± 20 | 7.5 ± 0.5 | <0.0004 |
|
|
| 212721.52+053434.54 | DO | 100 ± 15 | 7.5 ± 0.5 | <0.0004 |
|
|
| 095630.14+224311.52 | DO | 100 ± 10 | 7.8 ± 0.5 | 0.002 |
|
|
| 082724.44+585851.68 | DO | 90 ± 20 | 7.5 ± 0.5 | <0.0004 |
|
unusually strong He ii lines |
| 105956.01+404332.38 | DO | 90 ± 20 | 7.5 ± 0.5 | 0.01 |
|
ultrahigh-ionization lines |
| 094722.49+101523.62 | DO | 85 ± 15 | 7.5 ± 0.5 | 0.002 |
|
unusually strong He ii lines |
| 081625.47−002815.48 | DO | 80 ± 10 | 7.8 ± 0.5 | 0.01 |
|
|
| 064400.80+372022.70 | DO | 80 ± 15 | 8.0 ± 0.3 | 0.002 |
|
|
| 082134.95+173919.40 | DO | 65 ± 10 | 7.5 ± 0.5 | 0.002 |
|
unusually strong He ii lines |
Notes. Element abundances by number. Masses derived from evolutionary tracks in Fig. 5.
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