Binary star detection in the Open Cluster King 1 field

TL;DR

This study identifies two new binary star systems in the open cluster King 1 using photometric observations, periodogram analysis, and binary modeling, revealing their types and properties.

Contribution

It reports the first identification and detailed modeling of two binary systems in King 1, including a newly discovered Eclipsing Detached and a W-type W UMa binary.

Findings

Two binary systems detected, one Eclipsing Detached and one W-type W UMa.

First detailed modeling of these binaries in King 1.

Binary systems are background objects with respect to the cluster.

Abstract

A rarely studied open cluster, King 1 is observed using the 1.3m telescope equipped with 2k x 4k CCD at the Vainu Bappu Observatory, India. We analyse the photometric data obtained from the CCD observations in both B and V bands. Out of 132 detected stars in the open cluster King 1 field, we have identified 4 stellar variables and 2 among them are reported as newly detected binary systems, in this paper. The parallax values from GAIA DR2 suggest that the open cluster King 1 is at the background of these two detected binary systems, falling along the same line of sight, giving rise to different parallax values. The periodogram analysis was carried out using Phase Dispersion Minimization (PDM) and Lomb Scargle (LS) method for all the detected variables. PHOEBE (PHysics Of Eclipsing BinariEs) is extensively used to model various stellar parameters of both the detected binary systems. Based on the modeling results obtained from this work, one of the binary systems is reported for the first time as an Eclipsing Detached (ED) and the other as an Eclipsing Contact (EC) binary of W-type W UMa.