Abstract
During the last two years auvbyβ photometric survey of 85 Ca II emission stars from the Mount Wilson program on stellar activity has been carried out at the Calar Alto Observatory (Almeria, Spain). We present preliminary results for theuvby and β calibrations. Some stars displaying anomalousc1 andm1 indices, with photometric or spectroscopic data from previous studies, are reported. A reddening study for the complete sample is given.
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