Tennant, Allyn F.Bailey, JeremyWickramasinghe, D. T.Wu, KinwahFerrario, LiliaHough, J.2026-01-012026-01-010035-8711https://hdl.handle.net/1885/733801440The eclipsing AM Herculis binary WW Hor (EXO 023432-5232.3) was observed in the X-ray band with the ROSAT satellite and in the optical band with the 3.9-m telescope of the Anglo-Australian Observatory. A clear eclipse is seen in the X-ray light curve of this system for the first time. The relative location of the X-ray eclipse suggests that the accretion pole on the white dwarf surface has migrated in the last few years, consistent with the optical data. The 0.2-2 keV spectrum is well fitted with an absorbed power-law model. There is no indication of a soft blackbody component, although such a component could be masked by the absorption. The X-ray luminosity of the system in the 0.2-2 keV band is 1.04enPublisher Copyright: © Royal Astronomical Society.Binaries: closeCataclysmic variablesNovaeStars: individual: WW HorStars: magnetic fieldsX-rays: stars199410.1093/mnras/271.3.7330042365541