科研之友
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摘要
In this study, we present the first Johnson BV photometry of the eclipsing binary star ET Bootis, which is member of a physically connected visual pair. Analysis of times of light minima enables us to calculate accurate ephemeris of the system via O-C analysis and observed an increase in period which we believe is a result of the light-time effect in the outer visual orbit. Secondly, we determined the total brightness and color of the system in light maxima and minima. Photometric solution of the system indicates that the contribution of the visual pair to the total light is about 40% in Johnson V band. Furthermore, photometric analysis shows that the primary star in the eclipsing binary has F8 spectral type while it confirms the G5 spectral type for the visual pair. Masses of the components in eclipsing binary are M-1 = 1.109 +/- 0.014 M-circle dot and M-2 = 1.153 +/- 0.011 M-circle dot. Absolute radii of the components are R-1 = 1.444 +/- 0.007 R-circle dot and R-2 = 1.153 +/- 0.007 R-circle dot. Physical properties of the components leads 176 +/- 7 pc distance for the system and suggests an age of 6.5 billion years.
- 出版日期2012-10
