Akademik Veri Yönetim Sistemi
New Astronomy, cilt.125, 2026 (SCI-Expanded, Scopus)
We present a new analysis of the Algol type eclipsing binary UZ Lyr that combines light curve modeling with radial velocity fitting and a comprehensive timing study. High precision space photometry from Kepler and TESS is complemented by new CCD observations obtained with the T35 and T80 telescopes at the Ankara University Kreiken Observatory. A simultaneous light and radial velocity solution yields updated absolute parameters for both components. Using all available eclipse times derived from the literature and from the space and ground based photometry, the observed timing residuals are best reproduced by two light travel time signals consistent with additional companions having orbital periods of ∼15 yr and ∼168 yr. Long term direct integrations of the equations of motion indicate that this two companion configuration remains dynamically stable over a gigayear for both coplanar and edge on geometries. We also assess whether magnetic activity in the late type secondary could contribute to the observed cyclic timing variations and discuss this in the context of recent theoretical models. Overall, our results favor a stable two companion architecture for UZ Lyr and provide refined system parameters for future observational tests.