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This research is our forth article related to the topic of cyclic O-Cchanges, third components as the physical process that cause these changes andelliptical orbits of the third components. Here five more eclipsing binarystars were investigated: EQ Tau, IR Cas, IV Cas, RY Aqr and RZ Com. All of themhave cyclic O-C curve with superposition of parabolic trend. We computed themass transfer rate, minima possible mass of the third component and theirerrors for each of the researched stars.

Third components with elliptical orbits in the eclipsing binaries: EQ Tau, IR Cas, IV Cas, RY Aqr & RZ Com