The Digital Press

This study analyzes four W Ursae Majoris eclipsing binary star systems using multi-band photometry and low-resolution spectroscopy to understand their orbital characteristics and stellar properties. The research updates orbital periods, finds mass-transfer rates, and examines spectral emissions, contributing to knowledge of contact binary evolution.

Why it matters: Understanding orbital period changes and mass transfer rates reveals the evolutionary stages of close binary star systems.

The big picture: Multi-band and spectroscopic data combined with Gaia measurements improve accuracy in characterizing eclipsing binaries.

Stunning stat: J0805b’s orbital period is increasing at 4.2 × 10⁻⁷ days per year, indicating significant mass transfer.

Quick takeaway: Most systems are A-subtype contact binaries with mass ratios below 0.5 and high orbital inclinations above 79°.