A disk origin for superhumps in Ursae Majoris variables

Details A disk origin for superhumps in Ursae Majoris variables A disk origin for superhumps in Ursae Majoris variables

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.312..348h&link_type=abstract

Nature (ISSN 0028-0836), vol. 312, Nov. 22, 1984, p. 348-351.

Physics

12

Accretion Disks, Cataclysmic Variables, Eclipsing Binary Stars, Stellar Models, Brightness Distribution, Light Curve, Red Dwarf Stars, Roche Limit, Starspots, Stellar Mass Accretion, Variability, White Dwarf Stars

Scientific paper

A light source synthesis was performed to examine the feasibility of a partial eclipse as the cause of superhumps (30 percent variability) in cataclysmic binary superoutburst phenomena. Attention was focused on Z Cha, a binary with red dwarf primary material accreting onto a white dwarf. A numerically generated geometry of the system from an observer point of view demonstrates that the accretion disk may be large enough and oriented so that the primary cannot obscure all light emitted from the disk during superoutbursts. The superoutbursts can therefore arise in the disk, and slight orbital perturbations could cause discrepancies between the orbital and superhump periods. Finally, it is proven that the superhumps cannot be due to starspots on the primary dwarf.

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