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Table 1.
Derived mean rotation period and respective error (standard deviation) as a function of radii from the vortex flow centre, corresponding to the spectral analysis panels of Fig. 4 for angles ranging from 0° to 200°.
| Radius | Rotation period (in s) |
||||
|---|---|---|---|---|---|
| Hα line centre | Hα − 0.26 Å | Hα Doppler velocity | Ca II 8542 Å | Ca II − 0.055 Å | |
| 0.2″ | 274.6 ± 3.2 | 271.1 ± 8.5 | 264.4 ± 8.1 | 210.9 ± 8.2 | 217.7 ± 3.2 |
| 0.5″ | 237.5 ± 28.7 | 264.6 ± 12.6 | 257.9 ± 14.8 | 240.4 ± 42.0 | 233.5 ± 14.3 |
| 1″ | 251.3 ± 13.8 | 254.5 ± 20.0 | 271.2 ± 46.7 | 234.1 ± 12.3 | 220.9 ± 25.0 |
| 1.5″ | 241.2 ± 28.9 | 237.9 ± 16.8 | 224.6 ± 34.8 | – | – |
| 2″ | 246.6 ± 28.4 | 213.4 ± 30.5 | 203.7 ± 37.2 | – | – |
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