Table 1
Observed spectral lines in π Aquarii and their variations.
| He I | Fe II | Balmer lines | Other lines | ||||
|---|---|---|---|---|---|---|---|
| Line | Description | Line | Description | Line | Description | Line | Description |
| 4388 | ♦ | 4233 | ◯ | Hδ 4102 | ▴ | O II 4254 (?) | ♦ |
| 4471 | ♦ | 4549 (a) | ⊗ | Hγ 4340 | ▴ | O II 4417 | ♦ |
| 4713 | ♦ | 4584 | ◯ | H/β 4861 | ▴ | Mg II 4481 | ♦ |
| 4921 | ♦ | 4629 | ⊗ | Hα 6563 | •,▴ | Si III 4552 (a) | ⊗ |
| 5015 (a) | • | 4667 | ⊗ | Si III 4567 | ⊗ | ||
| 5047 | ♦ | 5018 (a) | • | C III/O II 4650 (?) | ♦ | ||
| 5875 | • | 5169 | ◯ | Ti I/O II 4675 (?) | ♦ | ||
| 6678 | ∘ | 5198 | ◯ | Si II 6347 (a) | ⊗ | ||
| 7065 | ∘ | 5235 | ◯ | Si II 6371 (a) | ⊗ | ||
| 5276 | ◯ | ||||||
| 5316 | ◯ | ||||||
| 5363 | ◯ | ||||||
| 6249 | ⊗ | ||||||
| 6389 (a) | ⊗ | ||||||
| 6385 | ⊗ | ||||||
Notes. (?)Uncertainty about the element. (a)Overlapping lines. Description of each line: ⊗ No signal or very weak transition between emission and absorption lines. • DPS emission with variations over the years. ♦ Absorption line with some variations. ∘ DPS in early years (2001–2014), disappearing and reforming in later years. ▴ Transition between shell-type and DPS profiles. ◯ DPS formation in final years (2014–2024).
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