Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.364..565p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 364, Issue 2, pp. 565-572.
Astronomy and Astrophysics
Astronomy
1
Accretion, Accretion Discs, Methods: Analytical, Techniques: Polarimetric, Binaries: Close, Novae, Cataclysmic Variables, X-Rays: Stars
Scientific paper
We report photopolarimetric observations of a new eclipsing polar (AM Herculis system) discovered in the Calán-Tololo survey. The photometry and polarimetry are modulated on a period of ~101 min. Circular polarization variations are seen from ~-8 to +12 per cent and from ~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 ~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.
Augusteijn Thomas
Potter Stephen B.
Tappert Claus
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