Two newly identified eclipsing binaries in open cluster NGC3532

We present light-curve analyses of two newly identified detached eclipsing binaries, namely HD96609 and HD303734, in the region of the richly populated open cluster NGC3532. HD96609 is composed of two main sequence stars (B9-A0V + A2V) with masses and radii of M-1 = 2.66 +/- 0.02M(circle dot), M-2 = 1.84 +/- 0.01M(circle dot), R-1 = 2.740 +/- 0.006 R-circle dot, and R-2 = 1.697 +/- 0.005 R-circle dot. The positions of the components on logM - logR plane suggest log(age/yr) 8.55, corresponding 350 +/- 40 Myr of age, which agrees with the 300 +/- 100 Myr age of NGC3532 estimated in previous studies. We find the distance of HD96609 as 460 +/- 17 pc, which is consistent with the 484(-30)(+35) pc distance of NGC3532, estimated from Gaia parallaxes. HD303734 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 HD303734 consists of A6V + K3V components. HD96609 and HD303734 are the second and third eclipsing binaries discovered in the region of NGC3532, after the first one, GV Car.

Automated summary

By conducting light-curve analyses, two newly identified detached eclipsing binaries, HD96609 and HD303734, were found in the region of the richly populated open cluster NGC3532. HD96609 consists of two main sequence stars, while HD303734 is an interesting totally eclipsing binary.