Photometric and polarimetric observations of the eclipsing polar SDSS J205017.84-053626.8

Details Photometric and polarimetric observations of the eclipsing polar SDSS J205017.84-053626.8 Photometric and polarimetric observations of the eclipsing polar SDSS J205017.84-053626.8

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.371..727p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 371, Issue 2, pp. 727-731.

Astronomy and Astrophysics

Astronomy

1

Accretion, Accretion Discs: Methods: Analytical: Techniques: Polarimetric: Binaries: Close: Novae, Cataclysmic Variables: X-Rays: Stars, Accretion Discs, Methods: Analytical, Techniques: Polarimetric, Binaries: Close, Novae, Cataclysmic Variables, X-Rays: Stars

Scientific paper

Photometric and polarimetric observations of the eclipsing polar (AM Herculis system) Sloan Digital Sky Survey 2050-05 are reported, in which both sets of data are found to be modulated on a period of ~94.2 min. This is the first detection of polarization in this system, unambiguously confirming its identification. Circular polarization variations are seen from ~ -10 to +4 per cent, consistent with a `two-pole' accretor. Both accreting poles are self-occulted by the white dwarf during parts of the orbit. The photopolarimetry from different epochs shows the system to be in different states. During the epochs showing a higher state the polarimetry suggests accretion occurs preferentially near the pole displaying positive circular polarization, and vice versa during the epoch showing a lower state. From the eclipses we estimate some of the system's parameters.

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