Possible chromospheric activity cycles in II Peg, UX Ari and V711 Tau

Details Possible chromospheric activity cycles in II Peg, UX Ari and V711 Tau Possible chromospheric activity cycles in II Peg, UX Ari and V711 Tau

2008-10-02

arxiv.org/abs/0810.0416v1

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun

Astronomy and Astrophysics

Astrophysics

4 pages, to appear in proceedings of Cool Stars 15

Scientific paper

10.1063/1.3099195

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.

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