Polarimetry of the eclipsing polar RX J0929.1-2404

Details Polarimetry of the eclipsing polar RX J0929.1-2404 Polarimetry of the eclipsing polar RX J0929.1-2404

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295..899b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 295, Issue 4, pp. 899-906.

Astronomy and Astrophysics

Astronomy

6

Accretion, Accretion Discs, Stars: Individual: Rx J0929.1-2404, Stars: Magnetic Fields, Novae, Cataclysmic Variables, White Dwarfs, X-Rays: Stars

Scientific paper

We report polarimetric, spectropolarimetric and photometric observations of the eclipsing ROSAT cataclysmic variable RX J0929.1-2404, which confirm that the system is a new polar (AM Herculis system). This brings the number of eclipsing polars to nine, with RX J0929.1-2404 being only the third such system above the period gap. Circular polarization variations from ~-20 to 10 per cent are seen over the 3.39-h orbital period, with a minimum around the time of eclipse. The photopolarimetric data were modelled using arc-shaped cyclotron emission regions in a centred dipole geometry. Results imply that RX J0929.1-2404 is a `two-pole' system, with one emission region partially visible at all orbital phases. Spectropolarimetry observations show some evidence for the presence of cyclotron humps in the continuum, with spacings consistent with a magnetic field strength of ~20 MG. Photometry of the eclipses provides information on the size of the emission region, which is consistent with a hotspot on the surface of the white dwarf. The eclipse duration implies an inclination in the range 70 deg<~i<~78 deg.

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