* Astronomy

Title: On the eclipsing cataclysmic variable star HBHA 4705-03
Authors: A.Rutkowski (1), T. Ak (2), T. R. Marsh (3), Z. Eker (4) ((1) Astronomical Observatory, Jagiellonian University, Krakow, Poland, (2) Istanbul University, Faculty of Sciences, Department of Astronomy and Space Sciences, Turkey, (3) University of Warwick, Department of Physics, Coventry, UK, (4) Akdeniz University, Faculty of Science, Department of Astronomy and Space Technologies Antalya, Turkey)

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. Other fundamental parameters was found with modelling. This approach gave: white dwarf mass M_1 = (0.8 ± 0.2) solar masses, secondary mass M_2=(0.497 ± 0.05) solar masses, orbital radius a=1.418 solar radii, orbital inclination i = (81.58 ± 0.5) deg, accretion disk radius r_d/a = 0.366 ± 0.002, and accretion rate dot{M} = (2.5 ± 2) * 10^{18}[g/s], (3*10^{-8} [solar masses/yr]). Power spectrum analysis revealed ambiguous low-period Quasi Periodic Oscillations centred at the frequencies f_{1}=0.00076 Hz, f_2=0.00048 Hz and f_3=0.00036 Hz. The B-V=0.04 [mag] colour corresponds to a dwarf novae during an outburst. The examined light curves suggest that HBHA 4705-03 is a nova-like variable star.

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