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

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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.
4 pages, to appear in proceedings of Cool Stars 15

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http://salesiana.dossiersoluciones.com/handle/123456789/223233

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0810.0416
 http://arxiv.org/abs/0810.0416
 COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings, Volume 1094, pp. 640-643 (2009)
 doi:10.1063/1.3099195

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arXiv