DQ Herculis in Profile: Whole Earth Telescope Observations and Smoothed Particle Hydrodynamics Simulations

Abstract

DQ Herculis was the Summer 1997 WET northern-hemisphere primary target. The O-C phase diagram of the 71-s signal reveals out-of-eclipse phase variations resulting from the self eclipses of a nearly edge-on, non-axisymmetric disc. We work the forward problem of simulating DQ Herculis numerically using the method of smoothed particle hydrodynamics (SPH), and from the time-averaged structure calculate the O-C phase variations as a function of inclination angle. The WET and SPH O-C phase variations match to a remarkable degree, and suggest a system inclination in the range 89.5 to 89.7 degrees.

12 pages, 4 figures, Fifth Whole Earth Telescope Workshop conference proceedings, submitted to Baltic Astronomy (plain TeX using balticw.tex). Version with high-res figures available at http://www.astro.fit.edu/wood/dqher_baltic.html Replacement paper corrects typos and author order

References in corpus (3)

• Smoothed Particle Hydrodynamics Simulations of Apsidal and Nodal Superhumps
• Cyclical period changes in the dwarf novae V2051 Oph and V4140 Sgr
• The Origin of Soft X-rays in DQ Herculis

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• Orbital periods of cataclysmic variables identified by the SDSS. VI. The 4.5-hr period eclipsing system SDSS J100658.40+233724.4
• The Spin-Period History of Intermediate Polars
• Spin-resolved spectroscopy of the intermediate polar DQ Her
• SPH Simulations of Direct Impact Accretion in the Ultracompact AM CVn Binaries
• FITDisk: A Cataclysmic Variable Accretion Disk Demonstration Tool