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Binary stars are believed to be key determinants in understanding globularcluster evolution. In this paper, we present the Multi-band photometricanalyses of five variables in the nearest galactic globular cluster M4, fromthe observations of CASE, M4 Core Project with HST for four variables (V48,V49, V51, and V55) and the data collected from T40 and C18 Telescopes of WiseObservatory for one variable (NV4). The light curves of five binaries areanalyzed using the Wilson-Devinney method (WD) and their fundamental parametershave been derived. A period variation study was carried out using times ofminima obtained from the literature for four binaries and the nature of thevariation observed is discussed. The evolutionary state of systems is evaluatedusing M-R diagram, correlating with that of a few well-studied close binariesin other globular clusters. Based on the data obtained from the Gaia DR3database, a three-dimensional Vector-Point Diagrams (VPD) was built to evaluatethe cluster membership of the variables, and two out of them (V49 and NV4) werefound to be not cluster members.

Multi-wavelength photometric study of five contact binaries in the field of globular cluster M4