![A X-ray binary Artist's impression of the X-ray binary Swift J1858.6-0814. We can see how the neutron star accretes material, via an accretion disk, from the companion star, and how some of that material is ejected in the form of a warm wind. Credits: Gabriel Pérez Díaz, SMM (IAC).](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/imagen%20resultados%20estella%20neutrones.jpg?itok=WPMyDDBX)
All disc-accreting astrophysical objects produce powerful disc winds. In compact binaries containing neutron stars or black holes, accretion often takes place during violent outbursts. The main disc wind signatures during these eruptions are blue-shifted X-ray absorption lines, which are preferentially seen in disc-dominated ‘soft states’. By contrast, optical wind-formed lines have recently been detected in ‘hard states’, when a hot corona dominates the luminosity. The relationship between these signatures is unknown, and no erupting system has as yet revealed wind-formed lines between the
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