Abstract:We show that the cycle periods (Pcyc) of slowly rotating lower main-sequence stars with well-defined periodic chromospheric activity can be parametrized by the rotation period Prot and the convective ...We show that the cycle periods (Pcyc) of slowly rotating lower main-sequence stars with well-defined periodic chromospheric activity can be parametrized by the rotation period Prot and the convective turnover time τc through a relation of the form Pcyc ∝ P b rotτ c c , with b = 2.0± 0.3 and c = −2.0± 0.3. This suggests a commondynamomechanism for slowly rotating stars lower main-sequence stars. Using a simple linear meanfield dynamo model, we are able to reproduce the observed relation if∆Ω, the total difference in angular velocity along the radial direction, scales as∆Ω ∝ P p rot with p = 1.1± 0.2, and if the α-coefficient scales as α ∝ Ro with q = −5.1± 0.6. This would suggest that, with increasing rotation rate, differential rotation decreases while |α| rapidly increases.Read More
Publication Year: 1997
Publication Date: 1997-07-01
Language: en
Type: article
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Cited By Count: 2
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