标题： GRO J1655-40和LMC X-3中的吸积盘演化：相对论和非相对论吸积盘模型 显示英文标题

标题： Accretion Disc Evolution in GRO J1655-40 and LMC X-3 with Relativistic and Non-Relativistic Disc Models

摘要： 黑洞X射线双星是研究强引力势中吸积现象的理想环境。 这些系统经历显著的吸积态转换，而X射线谱的分析被用来探测吸积盘及其演化的性质。 在这项工作中，我们对由RXTE PCA观测到的GRO J1655-40和LMC X-3获得的1800个$\sim$光谱进行了系统的调查，以通过描述黑洞X射线双星热发射的非相对论和相对论盘模型来探索吸积盘的本质。 我们证明，在整个爆发过程中使用经验多色盘模型DISKBB进行非相对论建模，得到的内盘半径显著较低且常常不具物理意义，并且对应的盘温（$\sim$50-60%）较高，与相对论对应模型KYNBB和KERRBB相比。 我们分别使用KERRBB和KYNBB得到了GRO J1655-40的无量纲自旋参数$a_{*}=0.774 \pm 0.069 $和$a_{*}=0.752 \pm 0.061 $。 我们报告了使用更新后的黑洞质量6.98${M_{\odot}}$得出的LMC X-3的自旋值$a_{*}=0.098 \pm 0.063$。 这两个测量结果与先前的研究一致。 利用我们的结果，我们强调了热辐射自洽建模的重要性，特别是在使用连续拟合方法估算自旋时，该方法假设盘始终终止于最内稳定圆轨道。 显示英文摘要

摘要： Black hole X-ray binaries are ideal environments to study the accretion phenomena in strong gravitational potentials. These systems undergo dramatic accretion state transitions and analysis of the X-ray spectra is used to probe the properties of the accretion disc and its evolution. In this work, we present a systematic investigation of $\sim$1800 spectra obtained by RXTE PCA observations of GRO J1655-40 and LMC X-3 to explore the nature of the accretion disc via non-relativistic and relativistic disc models describing the thermal emission in black-hole X-ray binaries. We demonstrate that the non-relativistic modelling throughout an outburst with the phenomenological multi-colour disc model DISKBB yields significantly lower and often unphysical inner disc radii and correspondingly higher ($\sim$50-60\%) disc temperatures compared to its relativistic counterparts KYNBB and KERRBB. We obtained the dimensionless spin parameters of $a_{*}=0.774 \pm 0.069 $ and $a_{*}=0.752 \pm 0.061 $ for GRO J1655-40 with KERRBB and KYNBB, respectively. We report a spin value of $a_{*}=0.098 \pm 0.063$ for LMC X-3 using the updated black hole mass of 6.98 ${M_{\odot}}$. Both measurements are consistent with the previous studies. Using our results, we highlight the importance of self-consistent modelling of the thermal emission, especially when estimating the spin with the continuum-fitting method which assumes the disc terminates at the innermost stable circular orbit at all times.