A&A 487, 271-276 (2008)
RXTE determination of the intermediate polar status of XSS J00564+4548, IGR J17195-4100, and XSS J12270-4859O. W. Butters1, A. J. Norton1, P. Hakala2, K. Mukai3, and E. J. Barlow1
1 Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
2 Tuorla Observatory, University of Turku, 21500 Piikkiö, Finland
3 CRESST and X-ray Astrophysics Laboratory NASA/GSFC, Greenbelt, MD 20771, USA
Received 10 April 2008 / Accepted 24 May 2008
Aims. We determine the nature of the intermediate polar candidates XSS J00564+4548 , IGR J17195-4100 , and XSS J12270-4859 .
Methods. Pointed RXTE observations searched for intermediate polar characteristics in these candidate systems.
Results. XSS J00564+4548 exhibits a period of 465.68 0.07 s, which we interpret as the spin period, an energy dependent modulation depth, and a spectrum that is fit by a 22 keV photoelectrically absorbed bremsstrahlung with an iron line profile. IGR J17195-4100 shows several candidate periodicities and a spectrum that is fit by a power law with an iron line. XSS J12270-4859 exhibits a candidate spin period of 859.57 0.64 s and a spectrum that is fit by a power law with no evidence of an iron line.
Conclusions. XSS J00564+4548 is confirmed to be an intermediate polar. IGR J17195-4100 and XSS J12270-4859 both show some properties of intermediate polars, but cannot be confirmed as definite members of the class here.
Key words: binaries: close -- stars: novae, cataclysmic variables -- X-rays: binaries
© ESO 2008