Study of the Iron Line and Low Energy Features in 4U 1728-34 with XMM-Newton

We propose a 30 ks XMM observation of 4U 172834 to perform a detailed study ofthe iron Kalpha line and other low energy features. This source shows a broad(virgul1 keV FWHM) iron line: several hypotheses can be proposed to explain the linewidth (e.g. relativistic and Doppler effects in an accretion disk, Comptonscattering, lineblending), and we expect that XMM will be able to resolve thecomplex line shape and to constrain the various models proposed. These kind ofsources are also expected to be rich of emission lines and absorption edges atlow energy (below virgul2 keV), because of the presence of a photoionized accretiondisk corona (ADC). These low energy features are an important diagnostic toolfor the physical conditions of the emitting regions. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]