Donors of Persistent Neutron-star Low-mass X-ray Binaries

Abstract

Properties of X-ray luminosities in low-mass X-ray binaries (LMXBs) mainly depend on donors. We have carried out a detailed study of donors in persistent neutron-star LMXBs (PLMXBs) by means of a population synthesis code. PLMXBs with different donors have different formation channels. Our numerical simulations show that more than 90% of PLMXBs have main sequence (MS) donors, and PLMXBs with red giant (RG) donors via stellar wind (Wind) are negligible. In our model, most of neutron stars (NSs) in PLMXBs with hydrogen-rich donors form via core-collapse supernovae, while more than 90% of NSs in PLMXBs with naked helium star (He) donors or white dwarf (WD) donors form via an evolution-induced collapse via helium star ($1.4\le M_{\mathrm{He}}/M_{\odot }\le 2.5$) or an accretion-induced collapses for an accreting ONeMg WD.

9 pages, 4 figures

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• Relativistic X-Ray Reflection and Photoionised Absorption in the Neutron-Star Low-Mass X-ray Binary GX 13+1
• Formation and Evolution of Galactic Intermediate/Low-Mass X-ray Binaries
• Population Synthesis of Millisecond X-ray Pulsars
• Low-mass X-ray Binaries with Strange Quark Stars