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Session 76 - Cataclysmic Variables and Accretion Disks.
Display session, Wednesday, January 15
Metropolitan Ballroom,
We analyze high time resolution optical spectra of the DQ Her type intermediate polar RX J0558.0+5353 obtained at the MMT in December 1995. The spectra cover nearly a complete orbit and reveal a pulse in the mean flux of the continua and in the fluxes of the H\beta, H\gamma and He II 4686 lines. This pulse, with a fundamental frequency of approximately 165\,c/d and a first harmonic at 316\,c/d confirms the spin period reported by Skillman (1995). Measurements of radial velocities in the line wings suggest that the HeII emission arises from an inner region of the accretion disk, closer to the white dwarf than the region where the Balmer lines are emitted. Doppler tomography of H\beta and HeII lines yields visual confirmation of this picture of accretion and emissions in this intermediate polar system.
