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Fast orbital decays of black hole X-ray binaries: XTE J1118+480 and A0620–00
Abstract We present new 10.4 m-GTC/OSIRIS spectroscopic observations of the black hole X-ray binary XTE J1118+480 that confirm the orbital period decay at $\dot{P}=-1.90\pm 0.57$ ms yr−1. This corresponds to a period change of −0.88 ± 0.27 μs per orbital cycle. We have also collected observations of the black hole …