Astronomy and Astrophysics, volume 542A, 22-22 (2012/6-1)
Characterization of new hard X-ray cataclysmic variables.
BERNARDINI F., DE MARTINO D., FALANGA M., MUKAI K., MATT G., BONNET-BIDAUD J.-M., MASETTI N. and MOUCHET M.
Abstract (from CDS):
We aim at characterizing a sample of nine new hard X-ray selected cataclysmic variable (CVs), to unambiguously identify them as magnetic systems of the intermediate polar (IP) type. We performed detailed timing and spectral analysis by using X-ray, and simultaneous UV and optical data collected by XMM-Newton, complemented with hard X-ray data provided by INTEGRAL and Swift. The pulse arrival time were used to estimate the orbital periods. The broad band X-ray spectra were fitted using composite models consisting of different absorbing columns and emission components. Strong X-ray pulses at the white dwarf (WD) spin period are detected and found to decrease with energy. Most sources are spin-dominated systems in the X-rays, though four are beat dominated at optical wavelengths. We estimated the orbital period in all system (except for IGR J16500-3307), providing the first estimate for IGRJ08390-4833, IGRJ18308-1232, and IGRJ18173-2509. All X-ray spectra are multi-temperature. V2069 Cyg and RX J0636+3535 posses a soft X-ray optically thick component at kT∼80eV. An intense Kα Fe line at 6.4keV is detected in all sources. An absorption edge at 0.76keV from OVII is detected in IGR J08390-4833. The WD masses and lower limits to the accretion rates are also estimated. We found all sources to be IPs. IGR J08390-4833, V2069 Cyg, and IGR J16500-3307 are pure disc accretors, while IGR J18308-1232, IGR J1509-6649, IGR J17195-4100, and RX J0636+3535 display a disc-overflow accretion mode. All sources show a temperature gradient in the post-shock regions and a highly absorbed emission from material located in the pre-shock flow which is also responsible for the X-ray pulsations. Reflection at the WD surface is likely the origin of the fluorescent iron line. There is an increasing evidence for the presence of a warm absorber in IPs, a feature that needs future exploration. The addition of two systems to the subgroup of soft X-ray IPs confirms a relatively large (∼30%) incidence.
binaries: close - X-rays: binaries - accretion, accretion disks - novae, cataclysmic variables
In ref list Schwarz et al. 2007, A&A, 473 is a misprint for Schwarz et al. 2007A&A, 473, 511.
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