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- W2521039012 abstract "We present new medium-resolution spectroscopic observations of the black hole X-ray binary Nova Muscae 1991 taken with X-Shooter spectrograph installed at the 8.2-m VLT telescope. These observations allow us to measure the time of inferior conjunction of the secondary star with the black hole in this system that, together with previous measurements, yield an orbital period decay of |$skew4dot{P}=-20.7pm 12.7$| ms yr−1 (−24.5 ± 15.1 μs per orbital cycle). This is significantly faster than those previously measured in the other black hole X-ray binaries A0620-00 and XTE J1118+480. No standard black hole X-ray binary evolutionary model is able to explain this extremely fast orbital decay. At this rate, the secondary star would reach the event horizon (as given by the Schwarzschild radius of about 32 km) in roughly 2.7 Myr. This result has dramatic implications on the evolution and lifetime of black hole X-ray binaries." @default.
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- W2521039012 date "2016-09-22" @default.
- W2521039012 modified "2023-10-15" @default.
- W2521039012 title "Extremely fast orbital decay of the black hole X-ray binary Nova Muscae 1991" @default.
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- W2521039012 doi "https://doi.org/10.1093/mnrasl/slw182" @default.
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