TL;DR
This study presents new multi-color light curves and photometric analysis of KR Cyg, suggesting it is a near-contact binary with a potential third star indicated by periodic eclipse timing variations.
Contribution
First detailed photometric analysis of KR Cyg indicating its near-contact nature and possible third component through eclipse timing variations.
Findings
KR Cyg is a near-contact binary with a large temperature difference.
Detected a possible 76-year periodic oscillation in eclipse timings.
Oscillation may be caused by a third star via light-time effect.
Abstract
New multi-color UBVR light curves of the eclipsing binary KR Cyg were obtained in 2005. Photometric solutions were derived using the Wilson- Devinney method. The result shows that KR Cyg is a near-contact binary system with a large effective temperature difference between the components, approximately 5230 K. All the times of minimum light were collected and combined with our observations obtained in 2010 and 2011. Analysing all the times of mid-eclipse, we found for the first time a possible periodic oscillation with an amplitude of 0.001 days and a period of ~76 years. The periodic oscillation could be explained by the light-time effect due to a presumed third component.
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