A Photometric Study of Four Recently Discovered Contact Binaries: 1SWASP J064501.21+342154.9, 1SWASP J155822.10-025604.8, 1SWASP J212808.86+151622.0 and UCAC4 436-062932

TL;DR

This study presents detailed photometric analysis of four newly discovered contact binary stars, determining their physical parameters and confirming their classification as W UMa type systems with shallow contact configurations.

Contribution

It provides the first detailed light curve modeling and parameter estimation for these four contact binaries, expanding the sample of well-studied W UMa systems without spectroscopic data.

Findings

All four systems are W UMa type binaries in shallow contact.

Primaries are late-type main-sequence stars, secondaries are evolved with magnetic activity.

Results align well with existing data on similar contact binaries.

Abstract

We present new, high-quality multicolor observations of four recently discovered contact binaries: 1SWASP J064501.21+342154.9, 1SWASP J155822.10-025604.8, 1SWASP J212808.86+151622.0, and UCAC4 436-062932, and analyze their light curves to determine orbital and physical parameters using the modeling program of G. Djura\v{s}evi\'c. In the absence of spectroscopic observations, the effective temperatures of the brighter components are estimated from the color indices, and the mass ratios are determined with the q-search method. The analysis shows that all four systems are W UMa type binaries in shallow contact configurations, consisting of late-type main-sequence primaries and evolved secondaries with active surface regions (dark or bright spots) resulting from magnetic activity or ongoing transfer of thermal energy between the components. We compare the derived orbital and stellar parameters for these four variables with a large sample of previously analyzed W UMa stars and find that our results fit it well.