DEP-Applied-Physics-and-Astronomy
DEP-Applied-Physics-and-Astronomy-MOB

Mohammad Musharraf Sabahuddin Azmi

Physical Parameters of a Selected Binary Stellar System

In this thesis, the spectroscopic binary system, HIP 7580, has been analysed for its physical and orbital properties. The orbital parameters are determined through Tokovinin’s dynamical method applied under IDL software, whereas the physical parameters are determined by applying Al-Wardat’s complex method. This method combines the magnitude difference through speckle interferometry and the synthetic spectral energy distribution (SED) of the binary components. The SED is calculated through the grids of Kurucz blanketed models (ATLAS9). The analysis has produced the following results: Te f f = (6390±100) K, log g = (4.4±0.12) Ra = (1.66±0.08) R⊙,MassA = (1.34±0.05)M⊙ for primary component and Te f f = (6090±100) K, log g = (4.4±0.12), Rb = (1.125±0.08) R⊙ ,MassB = (1.13± 0.05)M⊙ for secondary component. While comparing the total dynamical mass and the Al-Wardat mass sum, the parallax given by Gaia DR3 is found to be the most accurate parallax. The evolutionary tracks and isochrones of the system’s components are calculated and discussed, and the fragmentation process is suggested as the most likely process for the formation of the system.

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