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Revisiting the Cycle-rotation Connection for Late-type Stars by Mittag, M.; Schmitt, J. H. M. M.; Schröder, K. -P. is a scholarly article available to read on EtoBox.

What is Revisiting the Cycle-rotation Connection for Late-type Stars about?

We analyse the relation between the activity cycle length and the Rossby number and collected a sample of 44 main sequence stars with well-known activity cycle periods and rotation periods. We find a linear behaviour in the double-logarithmic relation between the Rossby number and cycle period. The bifurcation into a long and a short period branch is clearly real but it depends, empirically, on the colour index B-V, indicating a physical dependence on effective temperature and position on the main sequence. Furthermore, there is also a correlation between cycle length and convective turnover time with the relative depth of the convection zone. Based on this, we derive empirical relations between cycle period and Rossby number, and for the short period cycle branch relations, we estimate a scatter of the relative deviation between 14% and 28% on the long-period cycle branch. With these relations, we obtain a good match with the 10.3 yr period for the well known 11-year solar Schwabe cycle and a long-period branch value of 104 yr for the Gleissberg cycle of the Sun. Finally, we suggest that the cycles on the short-period branch appear to be generated in the deeper layers of the conve

Author

Mittag, M.; Schmitt, J. H. M. M.; Schröder, K. -P.

Published

2023

Language

EN