EDP Sciences
Free access
Volume 498, Number 2, May I 2009
Page(s) L17 - L19
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361/200911725
Published online 27 March 2009
A&A 498, L17-L19 (2009)
DOI: 10.1051/0004-6361/200911725


RXTE confirmation of the intermediate polar status of IGR J15094–6649

O. 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
    e-mail: oliver.butters@star.le.ac.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 $\pm$ 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 $\pm$ 4 keV Bremsstrahlung or $\Gamma$ = 1.8 $\pm$ 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