![Map of He and N velocities. Whilst nothing is revealed by He, it was analysis of N emissions that led to the detection of companion star X 1822-371. Map of He and N velocities. Whilst nothing is revealed by He, it was analysis of N emissions that led to the detection of companion star X 1822-371.](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/resultados22_23.jpg?itok=7sbYlUXb)
Ref 1: X1822-3711 | Ref 2: GX339-4 Detecting companion stars in these systems has been impossible until now. Thanks to a new technique developed at the IAC, they can now be detected through fluorescent CII/NIII emissions produced by X ray irradiation.
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