Research topic:Scorpius

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Scorpius X-1

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

Scorpius X-1 The brightest persistent X-ray source in the sky, and the first known celestial X-ray source apart from the Sun. It was discovered in 1962 during a sounding-rocket flight. Scorpius X-1 is a low-mass X-ray binary with an orbital period of 18.9 hours. The optical counterpart is a 13th-magnitude blue star known as V818 Sco, 9000 l.y. away. The X-rays arise from the transfer of material from this star on to a companion neutron star via an accretion disk. Scorpius X-1 is over three times brighter at X‐ray wavelengths than the second‐brightest constant X‐ray source, the Crab Pulsar.

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