A number of seasonal light curves of the RS CVn variables RU Cnc and CQ Aur, obtained from 1977 - 1978 to 1982 - 1983 at Catania and Torino Observatories, are studied by applying recently developed techniques of time series analysis for nonequally sampled data. The results of this study appear to support the hypothesis that dark spots are responsible for the photometric variations. A simple method, based on a solar analogy, allows to determine both the differential rotation and the latitude drift of the spotted regions. The latitude drift is accompanied by variations of the light curve amplitude suggesting the existence of spot activity cycles with a period of about 4 years in both binary systems.
Differential rotation and activity cycles in RS Canum Venaticorum binaries. I - RU CNC and CQ AUR
BUSSO, Maurizio Maria;
1984
Abstract
A number of seasonal light curves of the RS CVn variables RU Cnc and CQ Aur, obtained from 1977 - 1978 to 1982 - 1983 at Catania and Torino Observatories, are studied by applying recently developed techniques of time series analysis for nonequally sampled data. The results of this study appear to support the hypothesis that dark spots are responsible for the photometric variations. A simple method, based on a solar analogy, allows to determine both the differential rotation and the latitude drift of the spotted regions. The latitude drift is accompanied by variations of the light curve amplitude suggesting the existence of spot activity cycles with a period of about 4 years in both binary systems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
