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Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1248..137p&link_type=abstract
X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Confer
Other
X-Ray Spectroscopy, Binary Stars, Stellar Motion, Magnetic Fields, X-Ray, X-Ray Binaries, Orbital And Rotational Dynamics, Gravitational Radiation, Magnetic Fields, And Other Observations
Scientific paper
We present for the first orbital phase resolved spectra of intermediate polar (IP), EX Hya, during two different states with a factor of 3 difference between the X-ray count rates. We find definite spectral variations between different states of the source. The adopted model is composed of two MEKAL plus a VMCFLOW components to account for the continuum which is partially absorbed. Additional Gaussian lines at energies ~6, 4, 6.7 and 6.9 keV were also included to fit the residuals. The soft component of the spectrum is found to be harder during orbital minimum, suggesting the presence of extra ionized absorbing column. Moreover, the presence of cold emission Fekα line points toward the presence of a reflection component probably due to an accretion disk and/or a bulge at the impact zone.
Balman Solen
Pekon Yakup
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