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

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. Djurašević. 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.

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• Photometric analysis of overcontact binaries AK Her, HI Dra, V1128 Tau and V2612 Oph
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Cited by in corpus (8)

• Contact binaries at the short period cut-off I. statistics and the first photometric investigations of ten totally eclipsing systems
• Investigation of the Orbital Period and Mass Relations for W UMa-type Contact Systems
• Starspots in contact and semi-detached binary systems
• CoBiToM Project -- II: Evolution of contact binary systems close to the orbital period cut-off
• Comparative study of TESS photometry and radial velocities on six early K-type contact binaries with similar periods around 0.268 days
• YZ Phe: an active contact binary with variation of the O'Connell effect and orbital period change
• Light curve analysis of six totally eclipsing W UMa binaries
• The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni