1997A&A...323..151O

We show that the cycle periods (P_cyc) of slowly rotating lower main-sequence stars with well-defined periodic chromospheric activity can be parametrized by the rotation period P_rot and the convective turnover time τ_c through a relation of the form P_cyc∝P_rot^bτ_c^c, with b=2.0±0.3 and c=-2.0±0.3. This suggests a common dynamo mechanism for slowly rotating stars lower main-sequence stars. Using a simple linear mean-field dynamo model, we are able to reproduce the observed relation if {DELTA}{OMEGA}, the total difference in angular velocity along the radial direction, scales as {DELTA}{OMEGA}∝P_rot^p with p=1.1±0.2, and if the α-coefficient scales as α∝Ro^q with q=-5.1±0.6. This would suggest that, with increasing rotation rate, differential rotation decreases while |α| rapidly increases.