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Multi-cycle chromospheric activity in II Peg and V711 Tau

Buccino, A. P.; Mauas, P. J. D.

In this work, we studied the Mount Wilson indexes we obtained indirectly from both IUE high and low-resolution spectra of the RS CVn-type systems II Peg (K2IV) and V711 Tau (K1IV+G5V). For both systems, we found a long-term chromospheric activity cycle related to the mean level of activity of the primary star and a shorter cycle associated to the …