Light Curve Solutions of an Eclipsing Binary OGLE-GD-ECL-04451 with a Dramatic Change in Amplitude

TL;DR

This study analyzes the light curve variations of the eclipsing binary OGLE-GD-ECL-04451 over six years, revealing a significant amplitude change likely caused by a hot spot on the secondary star, using the Wilson-Devinney method.

Contribution

First detailed light curve analysis of OGLE-GD-ECL-04451 showing amplitude variation with hot spot modeling.

Findings

Amplitude decreased from 0.51 to 0.44 magnitudes.

Magnitude difference between maxima is 0.03.

Hot spot explains amplitude change and O'Connell effect.

Abstract

We present light curve solutions of the W UMa-type eclipsing binary OGLE-GD-ECL-04451, observed by both the \emph{Optical Gravitational Lensing Ex-periment} (\emph{OGLE}) program in 2006 and the \emph{Antarctica Survey Telescope} (\emph{AST3-1}) in 2012 at Dome A. We analyzed this binary system with the Wilson-Devinney(W-D) method 2013 version and derived the mass ratio $q=2.91 \pm 0.07$, the inclination $i=76.86^\circ \pm 0.23^\circ$, and the light variattion amplitud was $0^m.51$ based on the \emph{OGLE} data. From the \emph{AST3-1}'s data, we find that the amplitude dropped to $0^m.44$(2012) and the difference of magnitudes of the two light maxima is $0^m.03$. A hot spot was then added on the surface of the secondary to demonstrate the amplitude change and O'Conell effect of the binary system.