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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
141812.50024426.92 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
081625.47002815.48 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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