Speaker
Description
n recent years, citizen science efforts leveraging deep imaging surveys have identified a growing number of planetary nebula (PN) candidates, many of which are large, low-surface-brightness structures potentially representing the most evolved members of the PN population. However, most remain spectroscopically unconfirmed.
We present preliminary results from an ongoing long-slit spectroscopic survey using the Lulin One-meter Telescope. Our sample includes well-characterized PNe spanning different evolutionary stages as spectroscopic references, alongside recently claimed candidates from amateur discovery catalogs. Among the candidates observed, the majority yielded non-detections in key diagnostic lines, suggesting that a significant fraction of morphologically selected candidates are not genuine PNe. One notable exception is Momi 3, which exhibits clear emission with [N II] λ6583 stronger than Hα, consistent with a low-excitation evolved nebula or a nitrogen-enriched progenitor. These results highlight the necessity of systematic spectroscopic follow-up.
| Participate the oral/poster presentation award competition | Yes |
|---|