SIMBAD references

The determination of common chromospheres - roundchroms - for 32 close binary systems, all of RS CVn type, is described; the main parameters of these roundchroms - volumes, electron concentrations and masses, are estimated. Three types of roundchroms are established according to their structure. The empirical relationship between their electron concentration n_e and intercomponent distance a - n_e = K a^-0.80, discovered earlier, is confirmed by data for over fifty close binary systems. This law holds promise for the determination of component radii of close binary systems and some parameters of their roundchroms.