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- W2110127812 abstract "We report phase-resolved optical polarimetric, photometric and spectroscopic observations of RX J2115.7-5840 (= EUVE J2115-58.6, Craig 1996) which confirms the system to be a magnetic cataclysmic binary of the polar (AM Herculis) subclass. The optical light curve is sometimes flat and occasionally displays a pronounced bright phase, reminiscent of the self-eclipse of a small accretion spot by the revolving white dwarf, as seen in self-eclipsing polars. Our period search reveals ambiguous results only which can be interpret assuming that the white dwarf is not synchronously rotating with the binary orbit. We find circularly polarized cyclotron radiation with V/I ranging from 0% to -15% on one occasion, from -8% to +15% on another occasion. Compared with other polars, the self-occulted accretion region of RXJ2115 had an extreme red cyclotron spectrum. In addition, the system has an extreme hard X-ray colour during the ROSAT all-sky survey observation. Both properties suggest a low value of the magnetic field strength, and our best estimate gives B = 11+-2 MG. Due to the absence of significant M-star features in our low-resolution spectra we estimate the minimum distance to RXJ2115 to be d > 250pc (for an M5+ secondary star)." @default.
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- W2110127812 date "1997-05-14" @default.
- W2110127812 modified "2023-09-27" @default.
- W2110127812 title "RX J2115.7-5840: a short-period, asynchronous polar" @default.
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