Issue |
A&A
Volume 475, Number 2, November IV 2007
|
|
---|---|---|
Page(s) | L29 - L32 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20078700 | |
Published online | 23 October 2007 |
Letter to the Editor
RXTE confirmation of the intermediate polar status of Swift J0732.5–1331
1
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
Received:
11
October
2007
Accepted:
18
September
2007
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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