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Mon. Not. R. Astron. Soc. 000, 000000 (0000) Printed 20 January 2009 (MN LATEX style file v2.2) 2XMMi J225036.9+573154 a new eclipsing AM Her
 

Summary: Mon. Not. R. Astron. Soc. 000, 000­000 (0000) Printed 20 January 2009 (MN LATEX style file v2.2)
2XMMi J225036.9+573154 ­ a new eclipsing AM Her
binary discovered using XMM-Newton
Gavin Ramsay1
, Simon Rosen2
, Pasi Hakala3
, Thomas Barclay1,4
1Armagh Observatory, College Hill, Armagh, BT61 9DG
2Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH
3Tuorla Observatory, University of Turku, V¨ais¨al¨antie 20, FIN-21500 Piikki¨o, Finland
4Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT
20 January 2009
ABSTRACT
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 mins. An extended pre-eclipse absorption
dip is observed in soft X-rays at =0.8­0.9, with evidence for a further dip in the soft
X-ray light curve at 0.4. Further, X-rays are seen from all orbital phases (apart
from the eclipse) which makes it unusual amongst eclipsing polars. We have identified

  

Source: Armagh Observatory

 

Collections: Physics