A&A 475, L29-L32 (2007)
DOI: 10.1051/0004-6361:20078700

Letter

RXTE confirmation of the intermediate polar status of Swift J0732.5-1331

O. W. Butters¹, E. J. Barlow¹, A. J. Norton¹, and K. Mukai<sup>2

1</sup>  Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
    e-mail: o.w.butters@open.ac.uk
²  CRESST and X-ray Astrophysics Laboratory NASA/GSFC, Greenbelt, MD 20771, USA; Department of Physics, University of Maryland, Baltimore county, 1000 Hilltop Circle, Baltimore, MD 21250, USA

(Accepted 18 September 2007 / Received 11 October 2007)

Abstract
Aims.We intend to establish the X-ray properties of Swift J0732.5-1331 and therefore confirm its status as an intermediate polar.
Methods.We analysed 36 240 s of X-ray data from RXTE. Frequency analysis was used to constrain temporal variations and spectral analysis used to characterise the emission and absorption properties.
Results.The X-ray spin period is confirmed to be 512.4(3) s with a strong first harmonic. No modulation is detected at the candidate orbital period of 5.6 h, but a coherent modulation is present at the candidate 11.3 h period. The spectrum is consistent with a 37 keV bremsstrahlung continuum with an iron line at 6.4 keV absorbed by an equivalent hydrogen column density of around 10²² atoms cm^-2.
Conclusions.Swift J0732-1331 is confirmed to be an intermediate polar.

Key words: stars: binaries: general -- stars: novae, cataclysmic variables -- stars: individual: Swift J0732.5-1331 -- X-rays: binaries

© ESO 2007

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