Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..ses..db01w&link_type=abstract
American Physical Society, Southeastern Section Meeting, November 13-15, 1998 Miami, Florida, abstract #DB.01
Physics
Scientific paper
In this work we present the mean O-C diagram of the 71-s signal in the cataclysmic variable system DQ Herculis observed during the July 1997 Whole Earth Telescope campaign. Observed phase variations outside eclipse result from subtle variations in the height of the accretion disk rim in this edge-on system. We also present the results of a smoothed particle hydrodynamics simulation appropriate to DQ Her, from which we calculated ab initio the O-C diagram as a function of disk inclination. The calculated O-C diagrams are a remarkably good match to the observed phase variations of the 71-s signal, and prove that disks calculated using smoothed particle hydrodynamics can provide reliable estimates to the detailed structure of real disks, particularly if the disk's state is stationary and so can be time-averaged. The match is best for inclination angles over the small range 89.5^circ <= i < 89.7^circ, where the actual dependence is on i-meanθ, and where meanθ ~3.4^circ is one-half the opening angle of the disk's reprocessing region, averaged over azimuthal angle ψ'. Our results suggest it is likely that pulsed radiation is received from both sides of the accretion disk in DQ Her if i>=89.6^circ. Finally, changes of order 10% in θ(ψ) can yield large changes in the resulting O-C diagram and probably explain the non-stationary nature of the O-C phase diagram in the literature.
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