BSN：相接双星 OV Leo 和 V339 Leo 的光变曲线建模与轨道周期分析

本文结合地基观测与凌星系外行星巡天卫星（TESS）的测光数据，对相接双星系统 OV Leo 和 V339 Leo 进行了光变曲线建模与轨道周期分析。研究确定了这两个系统的物理参数，并揭示了它们在轨道周期变化与演化状态上的差异。

arXiv:2608.20772v1 Announce Type: new Abstract: We present a combined photometric and orbital period analysis of the contact binary systems OV Leo and V339 Leo using ground-based observations together with TESS photometry. The light curves were modeled with the BSN software through a Markov Chain Monte Carlo approach, providing physical estimates of the system parameters and their uncertainties. OV Leo is analyzed photometrically for the first time, while V339 Leo is reexamined using new observations and an updated modeling methodology. The light curve analysis show that both targets are W-subtype contact binaries in shallow-contact configurations. The O'Connell effect detected in V339 Leo is reproduced with a cool starspot model, whereas no spot is required for OV Leo. Three-dimensional geometric models further indicate that OV Leo undergoes total eclipses, while V339 Leo exhibits partial eclipses. Orbital period analysis based on eclipse timing extractions reveals opposite long-term period variations in the two systems, suggesting ongoing mass transfer under the assumption of conservative mass transfer. The absolute parameters were derived using the Gaia parallaxes, the photometric light curve solution, and standard astrophysical equations.