Light Curve Analysis Of W-uma Type Binary Systems Rz Umi, Oq Uma, Lp Uma

TL;DR

This paper presents detailed optical light curve analyses of three W UMa contact binary systems, deriving their fundamental parameters and exploring surface activity phenomena like spots to explain observed light curve asymmetries.

Contribution

It introduces new high-quality photometric data and applies Roche modeling with spot hypotheses to analyze the light curves of three W UMa binaries, providing detailed system parameters.

Findings

Derived fundamental parameters for Rz Umi, Oq Uma, Lp Uma.

Explained light curve asymmetries with spot models.

Constructed 3D models at various orbital phases.

Abstract

This study presents new, high-quality, optical photometric observations of three W UMa type contact binaries. The analysis of the corresponding light curves is made using Djurasevic's inverse problem method. To explain the light curve asymmetries and variations, we used the Roche model that involved regions containing spots on the components. The fundamental parameters of these systems were derived, including the mass ratios determined using the q-search method. Hypotheses involving active surface regions, such as dark spots on the primary and secondary components, or bright spots in the neck region due to magnetic activity or continuous mass transfer between components, were examined to explain the varying amplitudes of maxima and nearly equal minima depths in the light curves. Using the derived orbital and physical parameters, three-dimensional models were constructed for various orbital phases.