Table 2
Position, H2 1–0–S(1) fluxes, and molecular masses for various LISs in the studied PNe.
| Name | LISs | RA | Dec | Box [arcsec2] | Flux H2 1–0 S(1) [×10−15 erg s−1 cm−2] | H2 Mwarm [×10–07 M⊙] |
|---|---|---|---|---|---|---|
| NGC 2392 | 1 | 07:29:11.54 | +20:54:34.22 | 0.896×0.478 | 0.25 | 0.4 |
| 2 | 07:29:11.84 | +20:54:39.48 | 1.499×0.483 | 0.38 | 0.6 | |
| 3 | 07:29:11.66 | +20:54:50.73 | 1.396 × 0.551 | 0.37 | 0.6 | |
| 4 | 07:29:10.32 | +20:54:56.62 | 0.710×1.464 | 0.80 | 1.4 | |
| 5 | 07:29:09.90 | +20:54:53.93 | 0.539×1.903 | 0.53 | 0.9 | |
| NGC 6751 | 1 | 19:05:56.60 | −05:59:36.90 | 1.273×1.272 | 0.37 | 2.2 |
| 2 | 19:05:56.46 | −05:59:37.21 | 1.992×1.632 | 0.75 | 4.5 | |
| 3 | 19:05:56.08 | −05:59:39.95 | 1.692×1.549 | 1.04 | 6.2 | |
| 4 | 19:05:55.80 | −05:59:37.22 | 0.873×3.375 | 1.10 | 6.6 | |
| 5 | 19:05:55.80 | −05:59:29.84 | 1.832×2.208 | 1.73 | 10.4 | |
| H1§ | 19:05:58.37 | −05:59:47.58 | 1.413×2.194 | 2.26 | 13.6 | |
| H2§ | 19:05:52.57 | −05:59:42.75 | 1.317×2.348 | 3.84 | 23.1 | |
| H3§ | 19:05:52.52 | −05:59:48.79 | 1.409×2.584 | 2.27 | 13.6 | |
| H4§ | 19:05:58.41 | −05:59:32.30 | 1.351×1.377 | 1.85 | 11.1 | |
| NGC 6818 | 1 | 19:43:57.94 | −14:09:09.37 | 1.229 × 2.517 | 1.44 | 6.0 |
| 2 | 19:43:57.51 | −14:09:17.69 | 1.418×4.050 | 2.39 | 10.0 | |
| 3 | 19:43:57.91 | −14:09:21.85 | 1.497×2.761 | 2.17 | 9.0 | |
| NGC 6884 | 1 | 20:10:23.72 | +46:27:37.68 | 0.545×1.468 | 1.86 | 9.7 |
| 2 | 20:10:23.75 | +46:27:36.39 | 0.616×0.992 | 0.75 | 3.9 | |
| H1§ | 20:10:21.02 | +46:28:00.16 | 2.000×2.000 | 6.67 | 34.7 | |
| H2§ | 20:10:20.68 | +46:27:55.67 | 3.000×3.000 | 18.35 | 95.4 | |
| H3§ | 20:10:25.64 | +46:27:31.87 | 2.000×2.000 | 2.60 | 13.5 | |
| H4§ | 20:10:26.57 | +46:27:28.04 | 3.000×3.000 | 6.91 | 35.9 | |
| NGC 7354 | 1 | 22:40:20.12 | +61:17:23.82 | 0.984×2.349 | 1.35 | 3.0 |
| 2 | 22:40:21.13 | +61:17:04.84 | 1.389×1.784 | 1.41 | 3.1 | |
| 3 | 22:40:18.66 | +61:16:52.00 | 1.553×10.70 | 2.69 | 6.0 | |
| 4 | 22:40:20.28 | +61:17:06.98 | 1.559×2.940 | 1.47 | 3.3 | |
| Helix | †K1 | †22:29:33.41 | †-20:48:04.73 | †2×2 | †1.88×10−14 | 3.9×10−08 |
| Nebula | †2×10−08 | |||||
Notes. Distances were derived from Gaia DR3 parallax measurements (Gaia Collaboration 2023), yielding the following values: 1.83 kpc for NGC 2392, 3.44 kpc for NGC 6751, 2.86 kpc for NGC 6818, and 2.10 kpc for NGC 7354. The distance for NGC 6884 (3.2 kpc) was adopted from Guerrero et al. (2020). The last row corresponds to another LIS, a cometary knot of the Helix nebula, for comparison purposes. §Structures found in the nebular halo. †The average intensity over 2×2 arcsec2 and H2 warm mass are from Matsuura et al. (2007).
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