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Physical Parameters of the Visually Close Binary Systems Hip70973 and Hip72479

Published online by Cambridge University Press:  02 January 2013

M. Al-Wardat
M. Al-Wardat
Affiliation:
Physics 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: [email protected]
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Abstract

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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 = 5700 ± 75 K, = 5400 ± 75 K, log ga = 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 = 5400 ± 50 K, = 5180 ± 50 K, log ga = 4.50 ± 0.05, log gb = 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: atmospheresbinaries: closebinaries: visualstars: fundamental parametersstars: individual: Hip70973stars: individual: Hip72479
Type
Regular Papers
Information
Publications of the Astronomical Society of Australia , Volume 29 , Issue 4 , 2012 , pp. 523 - 528
Copyright
Copyright © Astronomical Society of Australia 2012

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