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Table 1
Main properties of Ou4.
| Ou4 | ||
|
|
||
| Lobe angular size |
|
|
| Linear size | 14.4 pc × 2.5 pc | (712 pc) |
| Centre∗ | 21h11m45.6 + 59°59′00″ | Equ. J2000 |
| HR 8119 |
21h11m48.2
|
Equ. J2000 |
|
Gal. J2000 | |
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||
| Tip of the south lobe | ||
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| Optical extinction | 1.1 ± 0.4 mag | |
| Te([O iii], [O ii]) | 55 000 K, ≥20 000 K | See Sect. 4.3 |
| Ne([S ii]) | ≥50–100 cm-3 | See Sect. 4.3 |
| Proper motion | ≲ ± yr-1 tentative |
See Sect. 4.4.2 |
| RV range† | − 100–+ 10 km s-1 | |
| Velocity | 112 km s-1 | See Sect. 4.4.3 |
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| Tip of the north lobe | ||
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| RV range† | − 55–+ 40 km s-1 | |
| Velocity | 83 km s-1 | See Sect. 4.4.3 |
Notes.
(†)
Heliocentric, determined in the region covered by the slit (see Fig. 9).
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