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http://dx.doi.org/10.5140/JASS.2006.23.3.189

LOW MASS RATIO CONTACT BINARY SYSTEMS HN UMa AND II UMa - III  

Lee Woo-Baik (Korea Astronomy & Space Science Institute)
Kim Ho-Il (Korea Astronomy & Space Science Institute)
Kang Young-Woon (Department of Astronomy, Sejong University)
Oh Kyu-Dong (Department of Earth Science Education, Chonnam National University)
Publication Information
Journal of Astronomy and Space Sciences / v.23, no.3, 2006 , pp. 189-198 More about this Journal
Abstract
We present newly observed BVRI CCD light curves for low mass ratio contact binaries, HN UMa and II UMa. The absolute dimensions of these objects were obtained by applying the Wilson-Devinney program to previously published spectroscopic analysis and to our observed photometric data. The evolutionary status of all 21 low mass ratio contact binary system including HN UMa and II UMa was then considered. The secondaries of all low mass ratio contact binaries are located below the zero age main sequence in HR diagram. This phenomenon could be explained by mass loss from the secondary component in the low mass contact binary system because even small mass loss affects luminosity decrease in the low mass stars.
Keywords
low mass ratio contact binary; binary solution; evolution of binary stars;
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