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New spectroscopic and photometric observations of CV J 0644 + 3344

We report photometric and simultaneous spectroscopic observations of the cataclysmic variable J0644+3344 and present calibrated Doppler tomography results of the object. We have calibrated the spectra for slit losses using simultaneous photometry. This has been used to construct reliable Doppler images in the Hα, Hβ and He II 4686 Å emission lines. We have also performed a radial velocity analysis using these emission lines to derive the primary semi–amplitude and used a cophasing method to determine the secondary K2 best value. We have improved the ephemeris of the object based on the published and our new photometric eclipse timings to obtain HJD = 254474.7927+0.26937446E. We derived a K1 = 123.2 ± 6.6 km s−1and K2 = 205.4 ± 6.7. Assuming a i > 76, the orbital parameters are M1 = 0.91 ± 0.04 M , M2 = 0.83 ± 0.04 M and a = 2.10 ± 0.03 R . Based on the Doppler tomography we conclude that J0644+3344 is a nova–like SW Sex type system.