RXTE confirmation of the intermediate polar status of IGR J15094–6649O. W. Butters1, 2, A. J. Norton2, K. Mukai3, 4, and E. J. Barlow2
1 Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
2 Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
3 CRESST and X-ray Astrophysics Laboratory NASA/GSFC, Greenbelt, MD 20771, USA
4 Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
Received 26 January 2009 / Accepted 13 March 2009
Aims. We aim to establish the X-ray properties of the intermediate polar candidate IGR J15094–6649 and therefore confirm its inclusion into the class.
Methods. 42 856 s of X-ray data from RXTE was analysed. Frequency analysis was used to constrain temporal variations and spectral analysis used to characterise the emission and absorption properties.
Results. A spin period of 809.7 0.6 s is present, revealed as a complex pulse profile whose modulation depth decreases with increasing X-ray energy. The spectrum is well fitted by either a 17 4 keV Bremsstrahlung or = 1.8 0.1 power law, with an iron emission line feature and significant absorption in each case.
Conclusions. IGR J15094–6649 is confirmed to be an intermediate polar.
Key words: stars: binaries: general -- stars: novae, cataclysmic variables -- stars: individual: IGR J15094-6649 -- X-rays: binaries
© ESO 2009