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Table 5
Decomposition of phenomenological steps of RR Lyrae atmospheric dynamics during a typical pulsation cycle (see Sect. 3).
| Step | φ interval | Phenomenon |
|---|---|---|
| 1 | 0.874–0.892 | Emergence of the main shock |
| 2 | 0.892–0.929 | Radiative shock wave phase |
| 3 | 0.320 | Maximum expansion of the sodium layer |
| 4 | 0.455 | Maximum expansion of the Hα layer |
| 5 | 0.320–0.455 | A two-step infalling motion |
| 6 | around 0.36 | A strong phostospheric compression |
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