Observations and Analysis OV Cf-Tucanae

RecentUBV photometry of the RS CVn binary CF Tuc is discussed and analysed. If we combine the results with previously published spectroscopy we find radii of 1.63R _⊙ for the hotter (∼6000 K) and 3.11R _⊙ for the cooler (∼4500 K) component; both stars having a mass of about 1.3M _⊙. The distance to the system is put at 86±15 pc. Though the photometric data is incomplete in the coverage of some regions out of the minima, there is no significant evidence of the ‘wave-type distortions’ — a known hallmark of RS CVn stars — and the data can be modeled by a standard eclipsing binary system in which the statistical test of goodness-of-fit (χ²) produces quite acceptable values for reasonable estimates of observational accuracy (≲0.01 mag). We, therefore, have no need to postulate any additional photometric complications, and feel entitled to some confidence in the reliability of the derived parameter set.