A&A 487, 271-276 (2008)
DOI: 10.1051/0004-6361:200809942

RXTE determination of the intermediate polar status of XSS J00564+4548, IGR J17195-4100, and XSS J12270-4859

O. W. Butters¹, A. J. Norton¹, P. Hakala², K. Mukai³, and E. J. Barlow<sup>1

1</sup>  Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
    e-mail: o.w.butters@open.ac.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

Abstract
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

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