Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 395, Issue 1, Pages 416-421Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.14528.x
Keywords
binaries: close; stars: individual: 2XMMi J225036.9+573154; novae, cataclysmic variables; X-rays: binaries
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Funding
- ESA Member States
- NASA
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We report the discovery of an eclipsing polar, 2XMMi J225036.9+573154, using XMM-Newton. It was discovered by searching the light curves in the 2XMMi catalogue for objects showing X-ray variability. Its X-ray light curve shows a total eclipse of the white dwarf by the secondary star every 174 min. An extended pre-eclipse absorption dip is observed in soft X-rays at phi = 0.8-0.9, with evidence for a further dip in the soft X-ray light curve at phi similar to 0.4. Further, X-rays are seen from all orbital phases (apart from the eclipse) which make it unusual amongst eclipsing polars. We have identified the optical counterpart, which is faint (r = 21), and shows a deep eclipse (> 3.5 mag in white light). Its X-ray spectrum does not show a distinct soft X-ray component which is seen in many, but not all, polars. Its optical spectrum shows Ha in emission for a fraction of the orbital period.
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