RXTE confirmation of the Intermediate Polar status of Swift J0732.5-1331

Details RXTE confirmation of the Intermediate Polar status of Swift J0732.5-1331 RXTE confirmation of the Intermediate Polar status of Swift J0732.5-1331

2007-10-11

arxiv.org/abs/0710.2248v1

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20078700

Aims. We intend to establish the X-ray properties of Swift J0732.5-1331 and therefore confirm its status as an intermediate polar. Method. 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 10^22 atoms cm^-2. Conclusions. Swift J0732-1331 is confirmed to be an intermediate polar.

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