2021AstBu..76...71A

In this work, the orbital elements are improved and the total masses of the three close visual binary systems CVBSs: HIP 11352, HIP 70973, and HIP 72479 are precisely calculated. The calculations were performed based on an assessment of the latest Gaia DR2 and Hipparcos trigonometric parallax measurements. The morphology and kinematics of orbits are fitted to the observational data available in the Fourth Catalogue of Interferometric Measurements of Binary Stars, and compared with the earlier orbits published in the Sixth Catalog of Orbits of Visual Binary Stars. The computation of orbital elements allows the determination and estimation of the mass sums for the three systems as: 1.81± 0.17 M_solar, 1.83± 0.07 M_solar, and 1.61± 0.26 M_solar for HIP 11352, HIP 70973, and HIP 72479 respectively. This suggests that these systems belong to the main sequence stars for both components. This will provide valuable insights into the evolution paths of these systems.