Photopolarimetric observations of the new eclipsing polar CTCV J1928-5001
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2005
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Abstract
We report photopolarimetric observations of a new eclipsing polar (AM Herculis system) discovered in the Calan-Tololo survey. The photometry and polarimetry are modulated on a period of similar to 101 min. Circular polarization variations are seen from similar to-8 to +12 per cent and from similar to 0 to 5 per cent in the red and blue parts of the optical spectrum, respectively. Two linearly polarized pulses are detected at orbital phases coinciding with the reversals in the circular polarization. This is consistent with a magnetic field strength of similar to 20 MG for the white dwarf primary, where accretion takes place at two regions. Both the accretion regions are self-occulted by the white dwarf during parts of the orbit. We estimate some of the system's parameters from its eclipses, which we further refine by modelling the polarimetric observations.
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accretion, accretion discs, methods : analytical, techniques : polarimetric, binaries : close, novae, cataclysmic variables, X-rays : stars