We present an X-ray spectral analysis of a black hole X-ray binary SLX 1746-331 during the 2023 outburst using five \textit{ Insight}-HXMT observations. We jointly use the reflection model \texttt{ relxillcp} and the general relativistic thermal thin disk model \texttt{ kerrbb} to fit the spectra from 2 - 100 keV. By jointly fitting the five spectra, we constrained the black hole mass to be $M=5.8\pm 0.3 M_{ \odot}$ and dimensionless spin parameter to be $a_{ *}=0.88^{ +0.01}_{ -0.02}$ (90 percent statistical confidence). The reflection model shows that SLX 1746-331 is a high-inclination system with the inclination angle $i=63.7^{ +1.3}_{ -1.0}$ degrees, the accretion disk has a density $\rm{ log}N\sim 16 ~\rm cm^{ -3}$. In addition, with the different reflection model \texttt{ relxilllp}, which assumes a lamp-post geometry corona, we still give similar results.
Categories: astro-ph.HE astro-ph.SR