تفاصيل الرسالة العلمية

This study aims to derive the full physical and geometrical parameters of the components of the binary system HIP 61986 by using Tokovinin?s dynamical method and Al-Wardat method. The spectral types of the two components are found to be K3 and K4 , and from the comparison between Al-Wardat's mass sum and the dynamical mass sum, it is found that the Al-Wardat's mass sum is the most accurate. It is found that the physical parameters that are obtained from parallax 1997 are the most accurate. The physical parameters of our binary system are: T_eff^A=4800 K R_A=0.86 R_? M_A=0.64 M_? ?log?g?_A=4.37 cgs T_eff^B=4607 K R_B=0.8045 R_? M_B=0.57 M_? ?log?g?_B=4.39 cgs