Physical and Geometrical Parameters of CVBS XI: COU1511 (HIP12552)

TL;DR

This study models the atmospheres of the close visual binary star COU1511 using synthetic spectral energy distributions to derive stellar parameters and orbital characteristics, enhancing understanding of its physical and geometrical properties.

Contribution

The paper applies Al-Wardat's complex method with Kurucz models to accurately determine the physical parameters and orbit of the binary star system COU1511.

Findings

Effective temperatures: 6180K and 5865K for components a and b.

Stellar radii: 1.262 and 1.006 solar radii.

System age estimated at 3.0 billion years.

Abstract

Model atmospheres of the close visual binary star COU1511 (HIP12552) are constructed using grids of Kuruz's blanketed models to build the individual synthetic SEDs for both components. These synthetic SED's are combined together for the entire system and compared with the observational one following Al-Wardat's complex method for analyzing close visual binary stars. The entire observational spectral energy distribution (SED) of the system is used as a reference for comparison between synthetic SED and the observed one. The parameters of both components are derived as: $T_{\rm eff}^{a} =6180\pm50 $\,K, $T_{\rm eff}^{b} =5865\pm70$\,K, log $g_{a}=4.35\pm0.12$, log $g_{b}=4.45\pm0.14$, $R_{a}=1.262\pm0.08R_\odot$, $R_{b}=1.006\pm0.07R_\odot$, $L_a=2.09\pm0.10 L_\odot$, $L_b=1.08\pm0.12L_\odot$, with spectral types F8 and G1 for both components (a,b) respectively, and age of $3.0\pm 0.9$ Gy. A modified orbit of the system is built and the masses of the two components are calculated as $M_a=1.17\pm0.11M_\odot$, $M_b=1.06\pm0.10M_\odot$.