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Title:
On magnetic-field induced non-geodesic corrections to the relativistic precession QPO model
Authors:
Bakala, Pavel; Šrámková, Eva; Stuchlík, Zdeněk; Török, Gabriel
Affiliation:
Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava Bezručovo nám. 13, CZ-74601 Opava, Czech Republic
Publication:
COOL DISCS, HOT FLOWS: The Varying Faces of Accreting Compact Objects. AIP Conference Proceedings, Volume 1054, pp. 123-128 (2008). (AIPC Homepage)
Publication Date:
09/2008
Origin:
AIP
PACS Keywords:
Astronomical observations, X-ray binaries, Helioseismology, pulsations, and shock waves, Artificial Earth satellites, Pulsations, oscillations, and stellar seismology, Neutron stars, Magnetohydrodynamics and plasmas
DOI:
10.1063/1.3002494
Bibliographic Code:
2008AIPC.1054..123B

Abstract

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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