Journal Article

Polarimetry of the eclipsing polar RX J0929.1 — 2404

David A. H. Buckley, Lilia Ferrario, Dayal T. Wickramasinghe and Jeremy A. Bailey

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 295, issue 4, pages 899-906
Published in print April 1998 | ISSN: 0035-8711
Published online April 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01349.x
Polarimetry of the eclipsing polar RX J0929.1 — 2404

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Abstract

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°≲i≲78°.

Keywords: accretion, accretion discs; stars: individual: RX J0929.1-2404; stars: magnetic fields; novae, cataclysmic variables; white dwarfs; X-rays: stars

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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