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| - VI. The 4.5-h period eclipsing system SDSS J100658.40+233724.4
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| - Orbital periods of cataclysmic variables identified by the SDSS
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| - We present time-resolved spectroscopy and photometry of SDSS J100658.40+233724.4, which we have discovered to be an eclipsing cataclysmic variable with an orbital period of 0.18591324 days (267.71507 min). The observed velocity amplitude of the secondary star is $276 \pm 7$ km s -1, which an irradiation correction reduces to $258 \pm 12$ km s -1. Doppler tomography of emission lines from the infrared calcium triplet supports this measurement. We have modelled the light curve using the lcurve code and Markov Chain Monte Carlo simulations, finding a mass ratio of $0.51 \pm 0.08$. From the velocity amplitude and the light curve analysis we find the mass of the white dwarf to be $0.78 \pm 0.12$ ${{M}_odot}$ and the masses and radii of the secondary star to be $0.40 \pm 0.10$ ${{M}_odot}$ and $0.466 \pm 0.036$ ${{R}_odot}$, respectively. The secondary component is less dense than a normal main sequence star but its properties are in good agreement with the expected values for a CV of this orbital period. By modelling the spectral energy distribution of the system we find a distance of $676 \pm 40$ pc and estimate a white dwarf effective temperature of $16\,500 \pm 2000$ K.
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