Fig. 9
Measured optical oscillation amplitudes detected among polars as a function of magnetic field strength. Also displayed are the QPO amplitudes predicted by numerical simulations of the shock instability (see text) onto a 0.8 M⊙ WD for different values of the accretion rate (Ṁ16 = 1.0 red line curve, Ṁ16 = 0.1 red dotted curve) and assuming a column cross-section of 1014 cm2.
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