Apsidal motion elements of six eccentric eclipsing binaries: V799 Cas, CO Cep, V1136 Cyg, V345 Lac, V364 Lac and V402 Lac

The apsidal motion analysis of the eccentric eclipsing binaries: V799 Cas, CO Cep, V1136 Cyg, V345 Lac, V364 Lac and V402 Lac have been presented. The method described by Lacy (1992) has been used for the apsidal motion analysis. The apsidal motion periods have been found to be 1229 ± 235, 64,600 ± 20,000, 586 ± 6, 14,240 ± 2800, 3502 ± 582 and 242 ± 60 yr for V799 Cas, CO Cep, V1136 Cyg, V345 Lac, V364 Lac and V402 Lac, respectively. The corresponding internal structure constant, logk¯2, for V799 Cas, V364 Lac and V402 Lac have been derived and compared to the theoretical values.

► We made the apsidal motion analysis of the six eccentric eclipsing binaries.
► The apsidal motion periods of the choosen systems were found.
► The internal structure constants for V799 Cas, V364 Lac and V402 Lac were derived and compared to the theoretical values.