Table 3.
PNe used to compute the HNC/HCN ratio.
| Object | HCN ∫Idv | HNC ∫Idv | HNC/HCN | Distance from | UV flux (c) |
|---|---|---|---|---|---|
| name | (K km s−1) | (K km s−1) | Ratio | CSPN (pc) | (ergs cm−2 s−1) |
| Helix globule A | 0.25 (0.01) | 0.11 (0.01) | 0.46 (0.01) | 0.14 (0.02) | 0.15 (0.01) |
| Helix globule B | 0.25 (0.02) | 0.16 (0.01) | 0.64 (0.06) | 0.11 (0.01) | 0.25 (0.01) |
| Helix globule C | 0.18 (0.01) | 0.09 (0.00) | 0.48 (0.04) | 0.14 (0.02) | 0.15 (0.01) |
| Helix rim (Outer) | 0.47 (0.10) | 0.30 (0.03) | 0.64 (0.14) | 0.35 (0.08) | 0.02 (0.00) |
| Helix rim (Inner) | 0.39 (0.09) | 0.23 (0.02) | 0.59 (0.14) | 0.24 (0.04) | 0.05 (0.00) |
| Helix east | 0.30 (0.14) | 0.33 (0.07) | 1.11 (0.58) | 0.44 (0.08) | 0.02 (0.00) |
| Helix west | 0.76 (0.06) | 0.49 (0.16) | 0.66 (0.22) | 0.44 (0.08) | 0.02 (0.00) |
| NGC 7027 | 11.6 (0.03) | 0.31 (0.02) | 0.03 (0.001) | 0.03 (a) | 240.82 |
| Hb 5 | 0.63 (0.22) | 0.24 (0.06) | 0.38 (0.17) | 0.09 (a) | 18.33 |
| NGC 6720 | 1.83 (0.02) | 0.67 (0.02) | 0.37 (0.01) | 0.17 (a) | 0.44 |
| NGC 6445 | 4.54 (0.02) | 1.12 (0.02) | 0.25 (0.01) | 0.19 (a) | 0.85 |
| NGC 2346 | 1.0 (0.2) | 1.0 (0.2) | 1.0 (0.28) | 0.32 (a) | 0.01 |
| NGC 6720 Rim | 2.08 (0.03) | 0.60 (0.03) | 0.29 (0.01) | 0.16 (0.07) | 0.52 (0.03) |
| NGC 6853 | 0.64 (0.01) | 0.20 (0.07) | 0.32 (0.01) | 0.16 (b) | 0.42 |
| NGC 2440 | 0.37 (0.12) | 0.05 (0.0) | 0.14 (0.05) | 0.12 (a) | 4.83 |
| NGC 6772 | 0.42 (0.02) | 0.15 (0.01) | 0.37 (0.03) | 0.20 (0.01) | 0.21 (0.02) |
| NGC 6781 | 3.83 (0.02) | 1.73 (0.02) | 0.45 (0.01) | 0.32 (0.09) | 0.12 (0.04) |
| Helix-SZ 1 | 0.13 (0.07) | 0.08 (0.03) | 0.63 (0.09) | 0.22–0.29 | 0.047 (0.018) |
| Helix-SZ 2 | 0.17 (0.09) | 0.16 (0.06) | 1.00 (0.26) | 0.34–0.36 | 0.024 (0.007) |
| Helix-SZ 3 | 0.18 (0.07) | 0.12 (0.04) | 0.59 (0.10) | 0.40–0.48 | 0.015 (0.004) |
Notes. NGC 2346 line intensities from Bachiller et al. (1989), while NGC 2440 and Hb 5 integrated intensities computed from Schmidt & Ziurys (2016, 2017). Helix-SZ values from Schmidt & Ziurys (2017). Other PN line intensities from Bublitz et al. (2019).
Distance estimated using Hα radius (Frew 2008), assumed 50% error in computed fluxes.
Distance estimated from H2 map (Kastner et al. 1996).
Incident UV flux assuming CSPN LUV = 3.55 × 1035 erg s−1 (Montez et al. 2015).
All other distances computed from observed angular displacement and expansion velocities. UV Flux intensities calculated using deprojected distances of targeted positions from CSPN and CSPN UV luminosities (Bachiller et al. 1989; Frew 2008; Montez et al. 2015; Bublitz et al. 2019). Error estimated from 12 m beam.
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