Two newly identified eclipsing binaries in open cluster NGC 3532

TL;DR

This paper reports the discovery and analysis of two new detached eclipsing binaries in the open cluster NGC 3532, providing stellar parameters and age estimates that align with the cluster's known properties.

Contribution

It presents the first detailed light curve analysis of two newly identified eclipsing binaries in NGC 3532, including stellar parameters and cluster age estimation.

Findings

HD 96609's stellar parameters and age match cluster estimates.

HD 303734 is an A6V + K3V eclipsing binary with shallow secondary eclipse.

Distances of the binaries are consistent with cluster distance from Gaia.

Abstract

We present light curve analyses of two newly identified detached eclipsing binaries, HD 96609 and HD 303734, in the region of the richly populated open cluster NGC 3532. HD 96609 is composed of two main sequence stars (B9-A0V + A2V) with masses and radii of $M_{1}=2.66\pm0.02$$M_{\odot}$, $M_{2}=1.84\pm0.01$$M_{\odot}$, $R_{1}=2.740\pm0.006$$R_{\odot}$, $R_{2}=1.697\pm0.005$$R_{\odot}$. The positions of the components on $log~M-log~R$ plane suggests log(age/yr) 8.55, corresponding $350\pm40$ Myr of age, which agrees with the $300\pm100$ Myr age of NGC 3532 estimated in previous studies. We find the distance of HD 96609 as $460\pm17$ pc, which is consistent with the $484^{+35}_{-30}$ pc distance of NGC 3532, estimated from GAIA parallaxes. HD 303734 is an interesting totally eclipsing binary with a quite shallow secondary eclipse. Using photometric properties of the system in conjunction with theoretical calibrations, we estimate that HD 303734 consists of A6V + K3V components. HD 96609 and HD 303734 are the second and third eclipsing binaries discovered in the region of NGC 3532, after the first one, GV Car.