English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In our research, we have studied 6 close binary stellar systems which areeclipsing variables of $\beta$ Lyrae and W Ursae Majoris types of variability.We have studied their O-C curves. To build them, we used moments of minima,listed in the BRNO database. Also, we used ones, which we obtained as theresult of processing of observational data taken from AAVSO database. As theresult of the O-C analysis, we detected that all of these stars have parabolicO-C curves, which might be caused by mass transfer from one component toanother. In an addition, 3 from researched stars (U Peg, V0523 Cas and WZ Cyg)have superimposed parabolic and cyclic O-C changes that could be caused bypresence of the third components in the systems. Also, we calculated minimalpossible masses of third components, rates of the mass transfer for thesesystems and corrected the ephemerides.

Effects of the Mass Transfer and Presence of the Third Components in Close Binary Stellar Systems