标题： 脉冲星的最大吸积质量 显示英文标题

标题： The maximum accreted mass of recycled pulsars

摘要： 中子星（NSs）的最大质量对于限制中子星的状态方程以及理解中子星和恒星级黑洞之间的质量间隙具有重要意义。 X射线双星中的中子星会通过从伴星吸积物质而增加质量（称为再循环过程），吸积过程中的不确定性给研究中子星出生时的质量带来了挑战。 在本工作中，我们考虑中子星自转演化的影响，研究了中子星吸积的质量，并给出了再循环过程中中子星的最大吸积质量。 通过探索一系列双星演化计算，我们得到了给定中子星出生质量以及质量转移效率下的最终中子星质量和最大吸积质量。 我们的结果表明，对于供体质量在$1.8\sim 2.4M_\odot$范围内的双星系统，中子星会相对吸积更多的物质，当剩余白矮星质量在$\sim 0.25-0.30M_\odot$范围内时，中子星会相对吸积更多的质量，且最大吸积质量与初始中子星质量呈正相关。 对于出生时为$1.4M_\odot$的中子星，质量转移效率为 0.3 时，最大吸积质量可以达到$0.27M_\odot$。 这些结果可用于估计观测中大质量中子星系统的最小出生质量。 显示英文摘要

摘要： The maximum mass of neutron stars (NSs) is of great importance for constraining equations of state of NSs and understanding the mass gap between NSs and stellar-mass black holes. NSs in X-ray binaries would increase in mass by accreting material from their companions (known as recycling process), and the uncertainties in the accretion process give challenge to study the NS mass at birth. {In this work, we investigate the NS accreted mass with considering the effect of NS spin evolution and give the maximum accreted mass for NSs in the recycling process. By exploring a series of binary evolution calculations, we obtain the final NS mass and the maximum accreted mass for a given birth mass of NS and a mass transfer efficiency. Our results show that the NSs can accrete relatively more material for binary systems with the donor masses in the range of $1.8\sim 2.4M_\odot$, the NSs accrete relatively more mass when the remnant WD mass is in the range of $\sim 0.25-0.30M_\odot$, and the maximum accreted mass is positively correlated with the initial NS mass. For a $1.4M_\odot$ NS at birth with a moderate mass transfer efficiency of 0.3, the maximum accreted mass could be $0.27M_\odot$. The results can be used to estimate the minimum birth mass for systems with massive NSs in observations.