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.
Astronomy and Astrophysics
- Pub Date:
- November 2007
- stars: binaries: general;
- stars: novae;
- cataclysmic variables;
- individual: Swift J0732.5-1331;
- X-rays: binaries;
- 4 pages, 5 figures, accepted for publication in A&