Table 1
Post-CE PNe undetected at mm wavelengths.
| Nebula | PN G | Telescope | Transition | HPBW | Δv resol. | rms | Notes |
|---|---|---|---|---|---|---|---|
| (arcsec) | (km s−1) | (mK) | |||||
| Observed sub-sample | |||||||
| Abell 41 | G009.6+10.5 | IRAM 30m | 12CO J = 1–0 | 21.3 | 1.0 | 12 | |
| 12CO J = 2–1 | 10.7 | 1.0 | 8.2 | ||||
| Hen 2-428 | G049.4+02.4 | IRAM 30m | 12CO J = 1–0 | 21.3 | 1.0 | 9.7 | |
| 12CO J = 2–1 | 10.7 | 1.0 | 6.8 | ||||
| Abell 63 | G053.8−03.0 | IRAM 30m | 12CO J = 1–0 | 21.3 | 1.0 | 16 | |
| 12CO J = 2–1 | 10.7 | 1.0 | 9 | ||||
| Necklace | G054.2−03.4 | IRAM 30m | 12CO J = 1–0 | 21.3 | 1.0 | 10 | 1 |
| 12CO J = 2–1 | 10.7 | 1.0 | 8.5 | 1 | |||
| V458 Vul | G058.6−03.6 | IRAM 30m | 12CO J = 1–0 | 21.3 | 1.0 | 9.9 | |
| 12CO J = 2–1 | 10.7 | 1.0 | 8.1 | ||||
| ETHOS 1 | G068.1+11.0 | IRAM 30m | 12CO J = 1–0 | 21.3 | 1.0 | 11 | 2 |
| 12CO J = 2–1 | 10.7 | 1.0 | 7.2 | 2 | |||
| Ou 5 | G086.9−03.4 | IRAM 30m | 12CO J = 1–0 | 21.3 | 1.0 | 12 | |
| 12CO J = 2–1 | 10.7 | 1.0 | 10 | ||||
| PM 1-23 | G221.8−04.2 | IRAM 30m | 12CO J = 1–0 | 21.3 | 1.0 | 48 | |
| 12CO J = 2–1 | 10.7 | 1.0 | 100 | ||||
| Subsample from the literature | |||||||
| NGC 246 | G118.8−74.7 | NRAO 12m | 12CO J = 2–1 | 31 | 1.3 | 62 | 3 |
| NGC 2392 | G197.8+17.3 | NRAO 12m | 12CO J = 2–1 | 31 | 1.3 | 57 | 3 |
| Abell 30 | G208.5+33.2 | NRAO 12m | 12CO J = 2–1 | 31 | 1.3 | 47 | 3 |
| Fg 1 | G290.5+07.9 | SEST 15m | 12CO J = 2–1 | 24 | 0.9 | 48 | 4 |
| NGC 5189 | G307.2−03.4 | SEST 15m | 12CO J = 2–1 | 24 | 0.9 | 82 | 4 |
| MyCn 18 | G307.5−04.9 | APEX 12m | 12CO J = 3–2 | 18 | 0.066 | 149 | 5 |
| NGC 6326 | G338.1−08.3 | APEX 12m | 12CO J = 3–2 | 18 | 0.066 | 68 | 5,6 |
| Hen 2-155 | G338.8+05.6 | SEST 15m | 12CO J = 2–1 | 24 | 0.9 | 42 | 4 |
| Sp 3 | G342.5−14.3 | SEST 15m | 12CO J = 2–1 | 24 | 0.9 | 52 | 4 |
| Lo 16 | G349.3−04.2 | APEX 12m | 12CO J = 3–2 | 18 | 0.066 | 52 | 5 |
Notes. (1) Position to the NW (by the largest knot visible in Hα, offset ~6 arcsec from the central star) observed at similar noise; (2) north cap (Hα peak, offset 29 arcsec from the central star) observed at similar noise; (3) data from Huggins & Healy (1989); (4) data from Huggins et al. (1996); (5) data from Guzman-Ramirez et al. (2018), re-analysed from archive; (6) (tentative) detection in original work not observed in our re-analysis.
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