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Table 4
Distances from shell-edge expansion.
| Nebula | Filter | θmin |
|
Vpost a | Dexp |
| [′′] | [mas yr-1] | [km s-1] | [kpc] | ||
|
|
|||||
| IC 418 | F658N | 6.4 ± 0.1 | 5.2 ± 0.5 | 22 ± 2 b | 1.16 ± 0.20 |
| IC 2448 | F502N | 9.5 ± 0.1 | 6.3 ± 2.5 | 35 ± 2 | 1.47 ± 0.60 |
| F658N | 9.5 ± 0.1 | 5.8 ± 2.3 | 35 ± 2 | 1.59 ± 0.64 | |
| IC 4593 | F656N | 6.5 ± 0.1 | 2.1 ± 0.8 | 24 ± 2 | 3.01 ± 1.20 |
| NGC 6826 | F502N | 12.6 ± 0.1 | 5.8 ± 0.8 | 32 ± 2 | 1.46 ± 0.22 |
| F658N | 12.6 ± 0.1 | 5.8 ± 2.0 | 34 ± 2 | 1.55 ± 0.62 | |
| NGC 7662 | F502N | 13.4 ± 0.1 | 5.3 ± 1.1 | 35 ± 3 | 1.74 ± 0.44 |
| F502N | 13.4 ± 0.1 | 5.9 ± 1.2 | 35 ± 3 | 1.56 ± 0.35 | |
Notes.
(b)
Peak-separation expansion velocity from [O i] λ 6302 Å after Neiner et al. (2000). The correction factor used here is 1.3 ± 0.1 instead of 1.25 ± 0.05; see text (Sect. 4.3.1) for more details.
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