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Title:
An XMM-Newton observation of the nova-like variable UX UMa: spatially and spectrally resolved two-component X-ray emission
Authors:
Pratt, G. W.; Mukai, K.; Hassall, B. J. M.; Naylor, T.; Wood, J. H.
Affiliation:
AA(CEA/Saclay, Service d'Astrophysique, L'Orme des Merisiers, Bât. 709, 91191 Gif-Sur-Yvette Cedex, France; MPE Garching, Giessenbachße, 85478 Garching, Germany), AB(Code 662, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA), AC(Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE), AD(School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL), AE(Keele University, School of Chemistry and Physics, Keele, Staffordshire ST5 5BG)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 348, Issue 3, pp. L49-L53. (MNRAS Homepage)
Publication Date:
03/2004
Origin:
MNRAS
MNRAS Keywords:
binaries: eclipsing, stars: individual: UX UMa, novae, cataclysmic variables, X-rays: stars
DOI:
10.1111/j.1365-2966.2004.07574.x
Bibliographic Code:
2004MNRAS.348L..49P

Abstract

In the optical and ultraviolet regions of the electromagnetic spectrum, UX Ursae Majoris is a deeply eclipsing cataclysmic variable. However, no soft X-ray eclipse was detected in ROSAT observations. We have obtained a 38 ksec XMM-Newton observation to constrain further the origin of the X-rays. The combination of spectral and timing information allows us to identify two components in the X-ray emission of the system. The soft component, dominant below photon energies of 2 keV, can be fitted with a multitemperature plasma model and is uneclipsed. The hard component, dominant above 3 keV, can be fitted with a kT~ 5 keV plasma model and appears to be deeply eclipsed. We suggest that the most likely source of the hard X-ray emission in UX UMa, and other systems in high mass transfer states, is the boundary layer.

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