October 1, 1998 CfA Colloquium


Title: HZ QPO in accreting neutron stars: do beat frequency models work?

Speaker: Michiel van der Klis

Abstract: The kilohertz quasiperiodic oscillations discovered with the Rossi X-ray Timing Explorer in accreting neutron stars are among the fastest astrophysical phenomena we know. They occur on the time scale of orbital motion only a few kilometers above a neutron star's surface, and likely probe regions in the accretion flow where strong-field general relativity is required to adequately describe the bulk motion of matter. I describe the current status of the phenomenology, and discuss the arguments for and against the beat frequency interpretation of these oscillations.

Reference for students: Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries - a Review