We study the Mount Wilson indices we obtained indirectly from IUE high and low resolution spectra of the RS CVn-type systems II Peg (K2IV), UX Ari (K0IV+G5V) and V711 Tau (K1IV+G5V), extensively observed by IUE from 1978 to 1996. We analyze the activity signatures, which correspond to the primary star, with the Lomb-Scargle periodogram. From the analysis of V711 Tau data, we found a possible chromospheric cycle with a period of 18 years and a shorter near 3-year cycle, which could be associated to a chromospheric flip-flop cycle. The data of II Peg also suggest a chromospheric cycle of near 21 years and a flip-flop cycle of 9 years approximately. Finally, we obtained a possible chromospheric cycle of near 6 years for UX Ari.
@article{arxiv.0810.0416,
title = {Possible chromospheric activity cycles in II Peg, UX Ari and V711 Tau},
author = {Andrea P. Buccino and Pablo J. D. Mauas},
journal= {arXiv preprint arXiv:0810.0416},
year = {2009}
}
Comments
4 pages, to appear in proceedings of Cool Stars 15