Table A.1.
List of observational data for the four He-sdO stars.
| Star | Instrument | Program ID | Wavelength range (Å) | Exposure time (s) | R |
|---|---|---|---|---|---|
| CD–31°4800 | UVES | 69.C-0171(A) | 3281–4562 | 2700 | 68 642 |
| CD–31°4800 | UVES | 69.C-0171(A) | 4583–6686 | 2700 | 107 200 |
| CD–31°4800 | FEROS | 074.B-0455(A) | 3527. . . 9216 | 600 | 48 000 |
| CD–31°4800 | FUSE | p2050603000 | 905–1185 | 11 747 | 22 000 |
| [CW83] 0904−02 | FEROS | 074.B-0455 | 3527–9216 | 1000 | 48 000 |
| [CW83] 0904−02 | FEROS | 074.B-0455 | 3527–9216 | 1000 | 48 000 |
| [CW83] 0904−02 | FUSE | p2051302000 | 905–1185 | 3157 | 22 000 |
| [CW83] 0904−02 | FUSE | p2051303000 | 905–1185 | 2385 | 22 000 |
| LSS 1274 | UVES | 077.C-0547(A) | 4726–6835 | 2100 | 66 320 |
| LSS 1274 | UVES | 077.C-0547(A) | 4726–6835 | 2100 | 66 320 |
| LSS 1274 | UVES | 077.C-0547(A) | 3024–3884 | 2100 | 49 620 |
| LSS 1274 | UVES | 077.C-0547(A) | 3024–3884 | 2100 | 49 620 |
| LSS 1274 | CASPEC | 3925–4953 | 18 000 | ||
| LSS 1274 | FUSE | p2051701000 | 905–1185 | 13 927 | 22 000 |
| LSS 1274 | FUSE | p2051702000 | 905–1185 | 7935 | 22 000 |
| LS IV +10° 9 | UVES | 67.D-0047(A) | 3281–4562 | 1500 | 53 750 |
| LS IV +10° 9 | CASPEC | 3930–4888 | 18 000 | ||
| LS IV +10° 9 | FUSE | p2050901000 | 905–1185 | 6639 | 22 000 |
| LS IV +10° 9 | FUSE | p2050903000 | 905–1185 | 45 577 | 22 000 |
Notes. We list the name of the star, the instrument used, the Program ID, the available wavelength range, the exposure time and the average resolving power for the observations we included in our analysis. For LS IV +10° 9, only the blue part of the UVES spectrum was available in the ESO Data Archive.
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