Physical and geometric parameters of the evolved binary system HD 6009

Abstract

Atmospheric modeling and dynamical analysis of the components of the visually close binary system (VCBS) HD6009 were used to estimate their individual physical and geometrical parameters. Model atmospheres were constructed using a grid of Kurucz solar metalicity blanketed models and used to compute the individual synthetic spectral energy distribution (SED) for each component separately. These SEDs were combined together to compute the entire SED for the system from the net luminosities of the components $a$ and $b$ located at a distance $d$ from the Earth. %The entire observational SED of the system was used as a reference for the comparison with the synthetic ones. We used the feedback modified parameters and iteration method to get the best fit between synthetic and observational entire SEDs. The physical and geometrical parameters of the system's components were derived as: $T_{\rm eff}^{a} =5625\pm75$\,K, $T_{\rm eff}^{b} =5575\pm75$\,K, log $g_{a}=3.75\pm0.25$, log $g_{b}=3.75\pm0.25$, $R_{a}=2.75\pm0.30 R_\odot$, $R_{b}=2.65\pm0.30 R_\odot$, $M_v^{a}= 2\fm80\pm0.30$, $M_v^{b}=2\fm93\pm0.30$, $M_a= 1.42\pm0.15 M_{\odot}$, $M_b=1.40\pm0.15 M_{\odot}$, $L_a=6.80\pm0.75 L_\odot$, $L_b=6.09\pm0.75 L_\odot$ and $\pi=14.43$mas dynamical parallax. The system is shown to be consist of G6 IV primary and G6 IV secondary components.