Publication date: Sep 2008
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.
Authors:
Bakala, Pavel; Šrámková, Eva; Stuchlík, Zdeněk; Török, Gabriel;