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

被引:15
作者
Butters, O. W.
Barlow, E. J.
Norton, A. J.
Mukai, K.
机构
[1] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England
[2] NASA, Goddard Space Flight Ctr, CRESST, Greenbelt, MD 20771 USA
[3] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, Greenbelt, MD 20771 USA
[4] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA
关键词
stars : binaries : general; stars : novae; cataclysmic variables; stars : individual : Swift J0732.5-1331; X-rays : binaries;
D O I
10.1051/0004-6361:20078700
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:L29 / L32
页数:4
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