Main parameters of neutron stars from quasi-periodic oscillations in low mass X-ray binaries

TL;DR

This paper uses relativistic models of neutron stars and observational data of X-ray binaries to estimate key parameters like mass, angular momentum, and quadrupole moment, enhancing understanding of neutron star properties.

Contribution

It introduces a method to derive neutron star parameters from quasi-periodic oscillations using the Hartle-Thorne spacetime and relativistic precession model.

Findings

Estimated mass, angular momentum, and quadrupole moment of GX 5-1.

Computed neutron star radius and angular velocity consistent with observational constraints.

Provided insights into neutron star structure through QPO analysis.

Abstract

We investigate the kilohertz quasi-periodic oscillations of low-mass X-ray binaries within the Hartle-Thorne spacetime. On the basis the relativistic precession model we extract the total mass $M$, angular momentum $J$, and quadrupole moment $Q$ of a compact object in a low-mass X-ray binary by analyzing the data of the Z -source GX 5-1. In view of the recent neutron star model we compute the radius, angular velocity and other parameters of this source by imposing the observational and theoretical constraints on the mass-radius relation.