Intermediate polars in the Swift/BAT survey: Spectra and white dwarf masses

Abstract

White dwarf masses in cataclysmic variables are difficult to determine accurately, but are fundamental for understanding binary system parameters, as well as binary evolution. We investigate the X-ray spectral properties of a sample of Intermediate Polars detected above 15 keV to derive the masses of their accreting white dwarfs. We use data from the Swift/BAT instrument which during the first 2.5 yrs of operation has detected 22 known intermediate polars. The X-ray spectra of these sources are used to estimate the mass of the white dwarfs. We are able to produce a mass estimate for 22 out of 29 of the confirmed intermediate polars. Comparison with previous mass measurements shows good agreement. For GK Per, we were able to detect spectral changes due to the changes in the accretion rate. The Swift/BAT detector with its combination of sensitivity and all-sky coverage provides an ideal tool to determine accurate white dwarf masses in intermediate polars.

arXiv comment8 pages, 4 figures, acc. for A&A

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• Developing the physical understanding of intermediate polars: an X-ray study of TV Col and V2731 Oph
• The disappearance and reformation of the accretion disc during a low state of FO Aquarii
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• Application of a new X-ray reflection model to V1223 Sagittarii
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• XMM-Newton EPIC and OM observation of Nova Centauri 1986 (V842 Cen)
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• Probing the Mysteries of the X-Ray Binary 4U 1210-64 with ASM, PCA, MAXI, BAT and Suzaku
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• First hard X-ray detection and broad band X-ray study of the unidentified transient AX J1949.8+2534
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• Confirmation of SRGt 062340.2-265751 as a nova-like cataclysmic variable with a possible magnetic nature