A Comprehensive Study of the Physical and Geometrical Characteristics of the Close Visual Binary System HIP 45571

TL;DR

This study uses Al-Wardat's method to analyze the physical and geometrical properties of the close visual binary system HIP 45571, providing detailed stellar parameters and a new parallax estimate, enhancing understanding of such systems.

Contribution

The paper presents a comprehensive spectrophotometric analysis of HIP 45571, deriving detailed stellar parameters and a new parallax value, using updated Gaia measurements and evolutionary models.

Findings

System consists of two subgiants with specific temperatures and radii.

Estimated system age of approximately 2.24 billion years.

Derived a new parallax value of 28.72 mas.

Abstract

In this paper, we estimated the physical and geometrical characteristics of the visually close binary stellar system Hip 45571, using Al-Wardat's method for analyzing binary and multiple stellar systems. We estimated the physical properties of the components of the system for the four measured parallax given by Gaia and Hipparcos, which gives a dynamical mass sum ranges between 2.43 and 2.52 solar mass using the new orbital parameters following Tokovinin's dynamical method. The method used is a spectrophotometrical computational technique that employs Kurucz plane-parallel line-blanketed model atmospheres for single stars. These model atmospheres are used to construct the synthetic spectral energy distributions (SED) of each component and for the entire system. To ensure the method's accuracy, we apply the fit between synthetic and observational photometry under different filters, including the recently published Gaia DR3 measurements. The positions of the components on the H-R diagram and the evolutionary tracks were used to estimate their masses and ages. We found that the system consists of 2.24 Gyr two F2.5 IV and F3.5 IV subgiant components with T_eff_A= 6800, T_eff_B= 6700, logg=4.19 m/s^2, logg=4.33 m/s^2, R_A=1.77 R_sun, R_B=1.34 R_sun, L_A=6.01 L_sun, L_B=3.25 L_sun and Z=0.011. Depending on the masses estimated by Al-Wardat's method, a new parallax value of 28.72+-0.30 mas was obtained. Which lies between the values given by DR2 and DR3. This research underscores the importance of precision and reliability in employing these methods and measurements in a dynamic context, deepening our understanding of such stellar systems.