X-ray spectral analysis of SU UMa type Dwarf Novae observed with ROSAT

Gun G., Ercan E. N.

INTERNATIONAL JOURNAL OF MODERN PHYSICS D, vol.12, no.4, pp.739-755, 2003 (SCI-Expanded) identifier identifier


X-ray spectral parameters were determined for eight SU UMa type Dwarf Novae observed with the ROSAT PSPC. The raw data were fitted with various spectral models and the best fit spectral models are found to be that of Raymond-Smith and Thermal Bremsstrahlung. The best fit temperatures were estimated to be between kT similar to1.1-1.8 keV while the Column Densities were found to be between N-H similar to2.4 x 10(20)-4.1 X 10(20) cm(-2). The estimated 0.1-2.4 keV fluxes were in the range of log F-X = -13 to -11 ergs cm(-2) s(-1). F-X/F-UV and F-X/F-opt rates were calculated to be between similar to0.09 and similar to0.37. This shows that most of the energy is radiated in the Optical and Ultraviolet band from the accretion disk in the quiescent state.