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Abstract: We extend recent work that included the effect of pressure forces to derivethe precession rate of eccentric accretion discs in cataclysmic variables tothe case of double degenerate systems. We find that the logical scaling of thepressure force in such systems results in predictions of unrealistically highprimary masses. Using the prototype AM CVn as a calibrator for the magnitude ofthe effect, we find that there is no scaling that applies consistently to allthe systems in the class. We discuss the reasons for the lack of a superhumpperiod to mass ratio relationship analogous to that known for SU UMa systemsand suggest that this is because these secondaries do not have a single valuedmass-radius relationship. We highlight the unreliability of mass-ratios derivedby applying the SU UMa expression to the AM CVn binaries.



Autor: K. J. Pearson

Fuente: https://arxiv.org/







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