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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

An initial investigation of two poorly studied eclipsing binaries separatedby ~3' in the sky is presented. The first star (GSC 2576-01248) was discoveredby the TrES exoplanet search project. The second one (GSC 2576-02071) wasidentified by the authors during CCD observations of GSC 2576-01248. We combineour dedicated CCD photometry with the archival TrES observations and data fromthe digitized photographic plates of the Moscow collection to determine periodsof the two variable stars with high precision. For GSC 2576-01248, addition ofhistorical photographic data provides a major improvement in accuracy of perioddetermination. No evidence for period change in these binary systems was found.The lightcurve of GSC 2576-01248 is characterized by a prominent variableO'Connell effect suggesting the presence of a dark starspot and asynchronousrotation of a binary component. GSC 2576-02071 shows a shift of the secondaryminimum from the phase =0.5 indicating a significant orbit eccentricity.

GSC 2576-02071 and GSC 2576-01248: two Algol-type eclipsing binaries studied using CCD observations and historical photographic data