Physical Parameters of the Visually Close Binary Systems Hip70973 and Hip72479
M. Al-WardatPhysics Department, Yarmouk University, PO Box 566 Irbid, 21163 Jordan and Department of Physics, Al-Hussein Bin Talal University, PO Box 20, 71111 Ma’an, Jordan. Email: mwardat@ahu.edu.jo
Publications of the Astronomical Society of Australia 29(4) 523-528 https://doi.org/10.1071/AS12004
Submitted: 12 January 2012 Accepted: 20 April 2012 Published: 5 June 2012
Abstract
Atmospheric modelling of the components of the visually close binary systems Hip70973 and Hip72479 was used to estimate the individual physical parameters of their components. The model atmospheres were constructed using a grid of Kurucz solar metalicity blanketed models and used to compute a synthetic spectral energy distribution for each component separately, and hence for the combined system. The total observational spectral energy distributions of the systems were used as a reference for comparison with the synthetic ones. We used the feedback modified parameters and iteration method to obtain the best fit between synthetic and observational spectral energy distributions. The physical parameters of the components of the system Hip70973 were derived as Teffa = 5700 ± 75 K, Teffb = 5400 ± 75 K, logga = 4.50 ± 0.05, log gb = 4.50 ± 0.05, Ra = 0.98 ± 0.07 R⊙, Rb = 0.89 ± 0.07 R⊙, and π = 26.25 ± 1.95 mas, with G4 and G9 spectral types, and those of the system Hip72479 as Teffa = 5400 ± 50 K, Teffb = 5180 ± 50 K, logga =4.50 ± 0.05, loggb = 4.60 ± 0.05, Ra = 0.89 ± 0.07 R⊙, Rb = 0.80 ± 0.07 R⊙, and π = 23.59 ± 1.00 mas, with G9 and K1 spectral types.
Keywords: stars: atmospheres — binaries: close — binaries: visual — stars: fundamental parameters — stars: individual: Hip70973 — stars: individual: Hip72479
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