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EX Hydrae
EX Hydrae is a variable star classified as an eclipsing intermediate polar-type cataclysmic variable, specifically of the DQ Herculis type.〔(SIMBAD )〕 The system varies in apparent magnitude from 9.6 to 14.〔(locator chart ) at AAVSO〕 The system consists of a white dwarf primary and an M-type secondary, of masses of and respectively.〔Beuermann, K., Harrison, T.E., MacArthur, B.E., Benedict, G.F., & Gansicke, B.T., 2003, "A Precise HST Parallax of the Cataclysmic Variable EX Hydrae, its System Parameters, and Accretion Rate," A&A 412, 821, abstract available online (here )〕 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.〔Eisenbart, S., Beuermann, K., Reinsch, K., & Gansicke, B.T., 2002, "Multi-wavelength Spectrophotometry of EX Hydrae," A&A 382, 984, abstract available online (here )〕 The cataclysmic outbursts appear to be caused by accretion of material from the M-star to the white dwarf.〔(AAVSO )〕
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.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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