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EX Hydrae

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EX Hydrae

EX Hydrae is an eclipsing intermediate polar (DQ Herculis) -type cataclysmic variable star that also undergoes eclipses. The system varies in apparent magnitude from 9.6 to 14.0. The system consists of a white dwarf primary and an M-type secondary, of masses of 0.4–0.7 M and 0.07–0.10 M respectively. The orbital period is 98.25696 minutes (0.068233846 days). The system is 65±11 parsecs distant, making EX Hya one of the closest cataclysmic variable stars. The cataclysmic outbursts appear to be caused by accretion of material from the M-star to the white dwarf.

EX Hydrae also possess a 67-minute oscillation, believed to be caused by the spin period of the white dwarf component. EX Hydrae's outbursts are unpredictable.

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