Fast X-ray Oscillations and General Relativity effects in Neutron star systems

Details Fast X-ray Oscillations and General Relativity effects in Neutron star systems Fast X-ray Oscillations and General Relativity effects in Neutron star systems

2002-07-12

arxiv.org/abs/astro-ph/0207278v1

Astronomy and Astrophysics

Astrophysics

2 pages, 3 figures; to appear in the Proceedings of the 9th Marcel Grossman Meeting, eds., Vahe Gurzadyan, Robert Jantzen and

Scientific paper

Kilohertz quasi-periodic oscillations (kHz QPOs) are probably caused by matter in Keplerian orbit at some preferred radius in the accretion disc around a compact star. In a given source, QPO frequencies can drift by a few hundred Hz following changes of the inner disc radius; but the disc cannot move closer to the star than the radius of the innermost stable circular orbit (ISCO) predicted by general realtivity, hence the kHz QPO frequencies must be limited by some maximum frequency.

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