BASIC STELLAR PARAMETER DETERMINATION FOR ACTIVE COOL ECLIPSING BINARIES

We examine procedures for the determination of reliable parameter sets characterizing stars in short period eclipsing binary systems of late r dwarf, generally sunlike, spectral types. These stars have magnetody namically active components and form a useful ''extension to the solar laboratory''. Their much more rapid rotation than that of the Sun imp lies correspondingly enhanced indications of activity - particularly w ith relatively large maculation effects in broadband data. We concentr ate on five such systems, for which we discuss new data and analyses - CG Cyg, ER Vul, YY Gem, BH Vir and UV Psc. Our main aim is to enable more reliable absolute comparisons between the basic properties of suc h stars and the Sun. Some indications of the ages of these binaries ca n also provide further pointers to the relative importance of differen t parameters (e.g. rotation, age, etc.), in determining stellar activi ty.