Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..255b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 2, June 1984, p. 255-260.
Astronomy and Astrophysics
Astrophysics
17
Binary Stars, Stellar Activity, Stellar Rotation, Variable Stars, Data Sampling, Fourier Series, Light Curve, Series Expansion, Starspots, Stellar Oscillations, Time Series Analysis
Scientific paper
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.
Blanco Cristina
Busso Maurizio
Catalano Santo
Marilli Ettore
Pazzani V.
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