Solar-Type Activity: Epochs of Cycle Formation

摘要: The diagram of indices coronal and chromospheric activity reveals stars where solar-type appears regular cycles are forming. Using new consideration a relation between the rotation rate, together with data on ages open clusters, we estimate age young Sun corresponding to epoch formation its cycle. properties this Sun, an slightly older than one billion years, briefly discussed. An analysis available long-term variability late-type leads conclusion that durations associated solartype increase deceleration stellar rotation; i.e., age. New magnetic fields comparatively G changes in roles large-scale local Such studies can help identify observational tests aimed at identifying conditions for cyclic lower part main sequence, test some predictions dynamo theory.