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Table 1.
Pitch angle below which the x1 family becomes unstable outside the second ILR for various values of the amplitude of the spiral perturbation and the pattern speed.
| Amplitude | Pattern speed | Pitch angle |
|---|---|---|
| ρ0 | Ωsp | a (in degrees) |
| 5 | 10 | 1 |
| 15 | 10 | 9 |
| 30 | 10 | 16 |
| 5 | 15 | 1 |
| 15 | 15 | 5 |
| 30 | 15 | 15 |
| 5 | 20 | 1 |
| 15 | 20 | 4 |
| 30 | 20 | 7 |
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