Table 1
Ages of planetary nebula where the [Fe II] 1.644 µm emission line was detected.
| PN name | Age (yr) | References |
|---|---|---|
| CRL 618 | ~200 | 1 |
| M 2–9 | 1200–2000 | 2 |
| NGC 2392 (outer shell) | ~9300 | 3 |
| NGC 2392 (jets) | 1800–2600 | 3, 4 |
| NGC 2440 | ~1000 | 5 |
| NGC 7027 | 700–2000 | 6, 7 |
| Hb 12 (outer knots) | 2860–3250 | 8 |
| Hb 12 (hourglass nebula) | ~1120 | 8 |
| Hb 12 (compact central region) | ~300 | 9 |
| BD +30° 3639 | 600–800 | 10, 11, 12 |
| Vy 2-2 | ~200 | 13, 14 |
| M 1-92 | ~900 | 15 |
| M 4-18 | ~3100 | 16 |
| M1-16 | ≤850 | 17 |
| NGC 7009 (main shell) | 1650 | 18 |
| NGC 7009 (outer shell) | 2200 | 18 |
| NGC 7009 (outer pair of knots) | ~900 | 19 |
| NGC 6543 (E25) | ~1040 | 20 |
| NGC 6751 (inner halo) | ~12800 | 21 |
| NGC 6751 (ring knots) | ~5100 | 21 |
| NGC 6751 (bipolar lobes) | ~2700 | 21 |
| NGC 6302 | ~2100 | 22,12 |
| IC 4634 | ~3210 | 23 |
Notes. (1) Bujarrabal et al. (1988); (2) Smith et al. (2005); (3) García-Díaz et al. (2012); (4) Guerrero et al. (2021); (5) Wolff et al. (2000); (6) Latter et al. (2000); (7) Santander-García et al. (2012); (8) Vaytet et al. (2009); (9) Miranda & Solf (1989); (10) Li et al. (2002); (11) Akras & Steffen (2012); (12) Gómez-Gordillo et al. (2020); (13) Miranda & Solf (1991); (14) Christianto & Seaquist (1998); (15) Bujarrabal et al. (1998); (16) De Marco & Crowther (1999); (17) Sahai et al. (1994); (18) Sabbadin et al. (2004); (19) Fernández et al. (2004); (20) Reed et al. (1999); (21) Clark et al. (2010); (22) Wright et al. (2011); (23) Guerrero et al. (2020).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.