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Table 1
A systematization of the cases where polewards migration or other features different from the solar case are deduced to explain observations.
| Case | Observational features/example | Dynamo interpretation |
|
|
||
| I | PW migration from mid-latitude and EW migration | |
| from high latitude (HR 1099) | See Sect. 3.2.5 | |
| II | Spot pattern extended in latitude | |
| with high and low latitude spots, | ||
| but no definite migration during the cycle (AB Dor) | Model 24 | |
| III | PW migration, i.e. the spot rotation period increases | |
| as the cycle progresses, contrary to the solar case | Model 13c | |
| IV | EW at low latitudes, PW at high latitudes | |
| (the latter can dominate when the star is viewed pole-on) | Model 8 | |
| V | Two separated narrow activity bands | Possible after a further |
| specialization of stellar hydrodynamics | ||
| VI | Migration + a standing pattern | Model 19 |
Notes. EW means equatorwards propagation, PW polewards propagation. If our investigations result in a model that appears suitable to explain a case, we identify it in the third column.
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