PONTI, GABRIELEGABRIELEPONTIBianchi, S.S.BianchiMuñoz-Darias, T.T.Muñoz-DariasDe, K.K.DeFender, R.R.FenderMerloni, A.A.Merloni2020-07-172020-07-1720160004-6337http://hdl.handle.net/20.500.12386/26483The advent of the new generation of X-ray telescopes yielded a significant step forward in our understanding of ionised absorption generated in the accretion discs of X-ray binaries. It has become evident that these relatively weak and narrow absorption features, sporadically present in the X-ray spectra of some systems, are actually the signature of equatorial outflows, which might carry away more matter than that being accreted. Therefore, they play a major role in the accretion phenomenon. These outflows (or ionised atmospheres) are ubiquitous during the softer states but absent during the power-law dominated, hard states, suggesting a strong link with the state of the inner accretion disc, presence of the radio-jet and the properties of the central source. Here, we discuss the current understanding of this field.STAMPAenArticle10.1002/asna.2016123392-s2.0-84964701672000375725600029https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.2016123392016AN....337..512PFIS/05 - ASTRONOMIA E ASTROFISICA