Author/s: Ref. 1 - Casares, J.; Steeghs, D.; Hynes, R. I.; Charles, P. A.; O'Brien, K. Ref. 2 - Hynes, R. I.; Steeghs, D.; Casares, J.; Charles, P. A.; O'Brien, K.
Reference: Ver Ref 1: X1822-3711 y Ref 2: GX339-4 / See Ref 1: X1822-3711 and 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.