On the cycle periods of stellar dynamos.

Details On the cycle periods of stellar dynamos. On the cycle periods of stellar dynamos.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..151o&link_type=abstract

Astronomy and Astrophysics, v.323, p.151-157

Astronomy and Astrophysics

Astrophysics

21

Stars: Magnetic Fields, Stars: Activity, Stars: Late-Type, Mhd

Scientific paper

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_{prop.to}P_rot_^btau_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}{prop.to}P_rot_^p^ with p=1.1+/-0.2, and if the α-coefficient scales as α{prop.to}Ro^q^ with q=-5.1+/-0.6. This would suggest that, with increasing rotation rate, differential rotation decreases while |α| rapidly increases.

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