Her X-1 shows coexisting 5-9 mHz and 10 mHz X-ray QPOs, with the lower-frequency component increasing as the source brightens, implying separate physical origins.
Accreting Neutron Stars and Black Holes: A Decade of Discoveries
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This is a review of recent observational and theoretical developments related to accreting neutron stars and black holes in binary systems.
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Observations of the X-ray Millihertz Quasiperiodic Oscillations in Hercules X-1
Her X-1 shows coexisting 5-9 mHz and 10 mHz X-ray QPOs, with the lower-frequency component increasing as the source brightens, implying separate physical origins.