On magnetic-field induced non-geodesic corrections to the relativistic precession QPO model

Details On magnetic-field induced non-geodesic corrections to the relativistic precession QPO model On magnetic-field induced non-geodesic corrections to the relativistic precession QPO model

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1054..123b&link_type=abstract

COOL DISCS, HOT FLOWS: The Varying Faces of Accreting Compact Objects. AIP Conference Proceedings, Volume 1054, pp. 123-128 (20

Astronomy and Astrophysics

Astronomy

1

Astronomical Observations, X-Ray Binaries, Helioseismology, Pulsations, And Shock Waves, Artificial Earth Satellites, Pulsations, Oscillations, And Stellar Seismology, Neutron Stars, Magnetohydrodynamics And Plasmas

Scientific paper

Fitting the observational data of the twin peak kHz quasiperiodic oscillations (QPO) from low mass X-ray binaries (LMXBs) by the relativistic precession model gives a substantially higher neutron star mass estimate, M~2 Msolar, than the ``canonical value'', M~1.4 Msolar. Using a fully general relativistic approach we discuss the non-geodesic corrections to the orbital and epicyclic frequencies of slightly charged circularly orbiting test particles caused by the presence of a neutron star magnetic field. We show that consideration of such non-geodesic corrections can bring down the neutron star mass estimate and improve the quality of twin peak QPO data fits based on relativistic precession frequency relations.

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