In this paper, analysis results of the photometric data of DO Dra will be
presented. DO Dra had been observed with 1 m LOAO telescope and 0.6 m CBNUO telescope
from 2005 through 2014. The data shows kind of periodic oscillation behavior in the
orbital period and also in the spin period. It has been found that these QPOs are not
observed always and that the periods vary from 30 min to 80 min. We also found that the
period variation seems to repeat itself with the period of 13.5 days. It is essential to
monitor this object in the future as well as to carry out model calculation in order to
have better understanding of these QPO phenomena.
We present 88 times of minima for 56 eccentric eclipsing binary systems determined from photometric observations at the Sobaeksan Optical Astronomical Observatory (SOAO) in Republic of Korea from February 2017 to December 2019.
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