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

Butters, O. W.; Barlow, E. J.; Norton, A. J. and Mukai, K. (2007). RXTE confirmation of the intermediate polar status of Swift J0732.5-1331. Astronomy & Astrophysics, 475(2) L29-L32.

DOI: https://doi.org/10.1051/0004-6361:20078700

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.

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