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The improvement of the capabilities of nowadays X-ray observatories, likeChandra or XMM-Newton, offers the possibility to detect both absorption andemission lines and to study the nature of the matter surrounding the neutronstar in X-ray binaries and the phenomena that produce these lines. The aim ofthis work is to discuss the different physical scenarios in order to explainthe meaning of the significant absorption feature present in the X-ray spectrumof 4U 1538-52. Using the last available calibrations, we discard thepossibility that this feature is due to calibration, gain effects or beproduced by the X-ray background or a dust region. Giving the energy resolutionof the XMM-Newton telescope we could not establish if the line is formed in theatmosphere of the neutron star or by the dispersion of the stellar wind of theoptical counterpart.

On the physical meaning of the 2.1 keV absorption feature in 4U 1538-52