Fig. 5: Constraints on neutron-star parameters.
From: Mass measurements show slowdown of rapid proton capture process at waiting-point nucleus 64Ge
a, Surface gravitational redshift versus distance of the source GS 1826–24 obtained through a comparison of the modelled light curves (Fig. 4) and the observational data from the year 2007 bursting epoch (Methods). The colours indicate 68% (red), 90% (yellow) and 95% (grey) confidence intervals. Two regions correspond to results using previously known masses (AME’20) and if our new masses are included (Updated). b, Neutron-star mass (MNS) versus radius (RNS) constraints calculated from the (1 + z) 95% confidence intervals shown in a. The limits for neutron-star compactness determined using other astrophysical observables are also shown, that is, from individual merger events62,63, quiescent low-mass X-ray binaries64 and pulsar radio timing combined with X-ray pulse-profile modelling65, along with the unphysical region excluded by causality66 (shown in black).
