Long-term monitoring of active stars IX. Photometry collected in 1993

As a part of an extensive program focused on the global properties and evol ution of active stars, high-precision UBV(RI)(c) and UBV photometry of 31 s elected stars is presented. The UBV(RI)(c) observations a ere collected at the European Southern Observatory over the 31 December 1992-18 January 1993 and the 20 November-3 December 1993 intervals. Additional UBV photometry o btained by tile "Phoenix" and by the Catania Astrophysical Observatory Auto matic Photoelectric Telescopes from 1990 to 1993 is also presented for some of the program stars. Significant evolution of the light curves, period va riations and evidence! for longterm variability of the global degree of spo ttedness are found. Some spectral classifications are revised and the infer red photometric parallaxes are compared, whenever possible, with the values measured by the Hipparcos satellite. These observations are finalized to t he construction of all extended photometric database, which can give import ant clues on topics such as the stability of spotted areas, differential ro tation, solar-like cycles and the correlation between inhomogeneities at di fferent atmospheric levels.