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| Paper: |
The Number of Rotations per Stellar Activity Cycle in G and K Main Sequence Stars |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1077 |
| Authors: |
Böhm-Vitense, E.; Davenport, J. R. A. |
| Abstract: |
We find that for G and K main sequence stars, the number of rotations per stellar activity cycle nc increases inversely as the rotation period rm prot decreases. The scaling constant C may vary by a factor of 10 for different types of stars, while nc may change by as much as 3 orders of magnitude. We show that we can understand this relation when we consider how the rotation period varies between the top and the bottom of the convection zone and with depth of the convection zone in stars of different mass. In general, faster rotating stars have thinner convection zones. We also show that the observed sequences in the relation between the rotation period and the activity cycle period for G and K stars are obtained if the rotation periods in the dynamo layer and at the surface are correlated, as is the case if both are due to convective angular momentum transport. |
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