Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1248..135b&link_type=abstract
X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Confer
Astronomy and Astrophysics
Astronomy
Spectrum, X-Ray Binary Stars, X-Ray Sources (Astronomical), Brightness, Composition, Energy Spectra And Interactions, X-Ray Binaries, X-Ray Sources, X-Ray Bursts, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification
Scientific paper
We present the frequency resolved energy spectra (FRS) of the low-mass X-ray binary dipper XB 1323-619 and EXO 0748-676 using archival XMM-Newton observations. The FRS of XB 1323-619 is well described by a single blackbody component with kT in a range 1.2-1.6 keV. We attribute this to an existing boundary layer, the likely source of the soft emission, supported by radiation pressure. We detect a different form of FRS for the frequency ranges 0.9-6 Hz and 8-30 Hz which is modeled best with a power law and a gaussian emission line at 6.5-0.1+0.1 keV. EXO 0748-676 reveals different variable regions found in different states with spectral hardening as the frequency increases showing similar FRS behavior to Z-sources. A disk blackbody emission component of 0.15 keV is found in the high state and it disappears at higher frequencies as expected. In the low state FRS (0.05-50 Hz) is independent of Fourier frequency and shows a fluorescence Fe line at 4.3-5.5 keV with large equivalent width.
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