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- W3100062464 abstract "Recently discovered quasi-periodic oscillations in the X-ray brightness of low-mass X-ray binaries are used to derive constraints on the mass of the neutron star component and the equation of state of neutron star matter. The observations are compared with models of rapidly rotating neutron stars which are calculated by means of an exact numerical method in full relativity. For the equations of state we select a broad collection of models representing different assumptions about the many-body structure and the complexity of the composition of superdense matter. The mass constraints differ from their values in the approximate treatment by ∼10 per cent. Under the assumption that the maximum frequency of the quasi-periodic oscillations originates from the innermost stable orbit, the mass of the neutron star is in the range M∼1.92ߝ2.25 M⊙. The quasi-periodic oscillation in the Atoll-source 4U 1820-30 in particular is only consistent with equations of state that are rather stiff at high densities, which is explainable, so far, only with pure nucleonic/leptonic composition. This interpretation contradicts the hypothesis that the protoneutron star formed in SN 1987A collapsed to a black hole, since this would demand a maximum neutron star mass below 1.6 M⊙. The recently suggested identification of quasi-periodic oscillations with frequencies of about 10 Hz with the Lense—Thirring precession of the accretion disc is found to be inconsistent with the models studied in this work, unless it is assumed that the first overtone of the precession is observed." @default.
- W3100062464 created "2020-11-23" @default.
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- W3100062464 date "1999-09-23" @default.
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- W3100062464 title "Quasi-periodic oscillations in low-mass X-ray binaries and constraints on the equation of state of neutron star matter" @default.
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- W3100062464 doi "https://doi.org/10.1046/j.1365-8711.1999.02743.x" @default.
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