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Table 2

Photospheric lines detected in the HST/STIS spectra.

Wavelength/Å Ion Transition

1162.24, 1162.67 Ne viii 5d6f
1164.54, 1164.76 Ne viii 5f6g
1164.88 Ne viii 5g6h
1165.94:, 1166.15:, 1166.18: Ne viii 5f6d
1167.8, 1169.3 Si vii
1168.85, 1168.99 C iv 3d4f
1171.12:, 1172.00: O vi 4p5s
1198.55, 1198.59 C iv 3d4p
1207.68: Si vi
1230.04, 1230.52 C iv 3p4s
1236.0 Si vii 3s′1Do−3p′1F
1238.82, 1242.80 N v 2s2p
1243.1 ?b
1287.80 ?
1293.9: Si vii 3s 1Po−3p 1D
1315.62:, 1315.85: C iv 4p7d
1316.3 ?
1317.7 ?b
1319.78 Ne vii
1323.3 ?
1351.21, 1351.29 C iv 4d7f
1352.97 C iv 4f7g
1382.1 ?
1401.6 ?b
1429.1 ?a
1437.65 ?b
1440.30, 1440.38 C iv 4s6p
1441.71442.7 ?
1450.0, 1450.55, 1451.7 ?b
1456.8 ?a
1457.85, 1458.25 ?a
1461.5 ?
1480.2 ?a
1484.9 ?b
1548.20, 1550.77 C iv 2s2p
1548.67, 1549.34, 1549.45 N v 4p5d
1585.81, 1586.11, 1586.14 C iv 4p6d
1619.62, 1619.74 N v 4f5g em
1640.42 He ii 23
1931.96, 1932.01, 1932.04 Ne viii 6h7i etc. em
1981.97, 1992.06, 1997.35 Ne vii 3s 3S−3p 3Po
2070.92:, 2071.02:, 2071.06: O vi 5g6h etc. em
2161.2: Ne vii 3s 1Po−3p 1D em
2253.39 He ii 310
2306.90 He ii 39
2386.13 He ii 38
2405.17, 2405.83, 2405.93 C iv 4p5d
2511.96 He ii 37
2525.02, 2525.27 C iv 4d5f
2530.74: C iv 4f5g
2698.52:, 2699.47: C iv 4p5s
2734.11 He ii 36
2820.7, 2860.1 Ne viii 3s3p
2907.19 C iv 5g7h
2976.75 Ne viii 7i8k etc. em
2982.19 N v 5g6h etc. em

Notes. “:” denotes uncertain detection, “?” unidentified line, “em” emission line.

(a)

Also visible in archival HST spectra of the PG 1159 stars NGC 246 and H1504+65.

(b)

Also visible in H1504+65.

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