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

We present new, high-quality multicolor observations of four recentlydiscovered contact binaries: 1SWASP J064501.21+342154.9, 1SWASPJ155822.10-025604.8, 1SWASP J212808.86+151622.0, and UCAC4 436-062932, andanalyze their light curves to determine orbital and physical parameters usingthe modeling program of G. Djura\v{s}evi\'c. In the absence of spectroscopicobservations, the effective temperatures of the brighter components areestimated from the color indices, and the mass ratios are determined with theq-search method. The analysis shows that all four systems are W UMa typebinaries in shallow contact configurations, consisting of late-typemain-sequence primaries and evolved secondaries with active surface regions(dark or bright spots) resulting from magnetic activity or ongoing transfer ofthermal energy between the components. We compare the derived orbital andstellar parameters for these four variables with a large sample of previouslyanalyzed W UMa stars and find that our results fit it well.

the astronomical journal

A Photometric Study of Four Recently Discovered Contact Binaries: 1SWASP  J064501.21+342154.9, 1SWASP J155822.10-025604.8, 1SWASP J212808.86+151622.0  and UCAC4 436-062932