IAFE 05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Possible chromospheric activity cycles in II Peg, UX Ari and V711 Tau
Autor/es:
BUCCINO, A.P.; MAUAS, P.J.D.
Lugar:
Escocia
Reunión:
Conferencia; Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings, Volume 1094, pp. 640-643; 2008
Resumen:
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 ~3 year cycle, which could be associated to a
chromospheric flip-flop cycle. The data of II Peg also suggest a
chromospheric cycle of ~21 years and a flip-flop cycle of ~9 years.
Finally, we obtained a possible chromospheric cycle of ~6 years for UX
Ari.
