On the Eclipsing Cataclysmic Variable Star HBHA 4705-03

We present observations and analysis of a new eclipsing binary HBHA 4705-03. Using decomposition of the light curve into accretion disk and hot spot components, we estimated photometrically the mass ratio of the studied system to be q = 0.62 +/- 0.07. Modeling of the system yields the following fundamental parameters: white dwarf mass M-1 = (0.8 +/- 0.2) M-circle dot, secondary mass M-2 = (0.497 +/- 0.05) M-circle dot, orbital radius a = 1.418 R-circle dot, orbital inclination i = (81.degrees 58 +/- 0.degrees 5), accretion disk radius r(d)/a = 0.366 +/- 0.002, and accretion rate (M) over dot = (2.5 +/- 2) x 10(18) [g/s] (3 x 10(-8) M-circle dot/yr). Power spectrum analysis revealed a set of possible low-period Quasi Periodic Oscillations centered at the frequencies f(1) = 0.00076 Hz, f(2) = 0.00048 Hz and f(3) = 0.00036 Hz. The system B - V = 0.04 mag corresponds to a dwarf nova color during an outburst. The light curves of HBHA 4705-03 suggest that it is a nova-like variable star.