Journal Article

<i>XMM–Newton</i> confirmation of a new intermediate polar: XMMU J185330.7−012815

C. Y. Hui, K. Sriram and C.-S. Choi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 1, pages 314-320
Published in print January 2012 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI:
XMM–Newton confirmation of a new intermediate polar: XMMU J185330.7−012815

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We report on the results of a detailed spectro-imaging and temporal analysis of an archival XMM–Newton observation of a new intermediate polar XMMU J185330.7−012815. Its X-ray spectrum can be well described by a multitemperature thermal plasma model with the K lines of heavy elements clearly detected. Possible counterparts of XMMU J185330.7−012815 have been identified in optical and ultraviolet (UV) bands. The low values of the inferred X-ray-to-UV and X-ray-to-optical flux ratios safely rule out the possibility of its being an isolated neutron star. We confirm the X-ray periodicity of ∼238 s but, differently from the previous preliminary results, we do not find any convincing evidence of phase shift in this observation. We further investigate its properties through an energy-resolved temporal analysis and find that the pulsed fraction monotonically increases with energy.

Keywords: stars: individual: XMMU J185330.7−012815; novae, cataclysmic variables; X-rays: stars

Journal Article.  5299 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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