Mass and radius estimation for the neutron star in X-ray burster 4U 1820-30
K. Kusmierek, J. Madej, E. Kuulkers
TL;DR
This paper introduces a novel method for estimating neutron star masses and radii using X-ray burst spectra, applied to 4U 1820-30, providing specific measurements with uncertainties.
Contribution
A new spectral fitting technique for neutron star mass and radius estimation applied to thermonuclear X-ray bursts.
Findings
Estimated neutron star mass: 1.3 ± 0.6 M_sun
Estimated radius: 11^{+3}_{-2} km
Method demonstrated on real observational data
Abstract
We present a new method for determining masses and radii of neutron stars residing in thermo-nuclear X-ray burst sources. To illustrate this method we apply it to a burst from the source 4U 1820-30 recorded by the Rossi X-Ray Timing Explorer. Fits of the observed X-ray spectra to grids of Comptonised model atmospheres yield estimates for the mass and radius of the neutron star, M=1.3 \pm 0.6 M_sol and R=11^+3_-2 km, respectively.
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