The radiative efficiency of neutron stars at low-level accretion

Erlin Qiao, B. F. Liu

When neutrons star low-mass X-ray binaries (NS-LMXBs) are in the low-level accretion regime (i.e., $L_{\mathrm{X}}\lesssim 10^{36}\mathrm{erg}{\mathrm{s}}^{-1}$), the accretion flow in the inner re…