SIMBAD references

1997A&A...323..151O - Astronomy and Astrophysics, volume 323, 151-157 (1997/7-1)

On the cycle periods of stellar dynamos.


Abstract (from CDS):

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∝Protbτcc, 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}∝Protp with p=1.1±0.2, and if the α-coefficient scales as α∝Roq with q=-5.1±0.6. This would suggest that, with increasing rotation rate, differential rotation decreases while |α| rapidly increases.

Abstract Copyright:

Journal keyword(s): stars: magnetic fields - stars: activity - stars: late-type - MHD

Simbad objects: 21

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