The Disk Veiling Effect of the Black Hole Low-Mass X-ray Binary A0620-00

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Wan-Min Zheng Qiaoya Wu Jianfeng Wu Song Wang Mouyuan Sun Jing Guo Junhui Liu Tuan Yi Zhi-Xiang Zhang Wei-Min Gu Junfeng Wang Lijun Gou Jifeng Liu Paul J. Callanan Luis C. Ho Penélope Longa-Peña Jerome A. Orosz Mark T. Reynolds

摘要： The optical light curves of quiescent black hole low-mass X-ray binaries often exhibit significant non-ellipsoidal variabilities, showing the photospheric radiation of the companion star is veiled by other source of optical emission. Assessing this "veiling" effect is critical to the black hole mass measurement. Here in this work, we carry out a strictly simultaneous spectroscopic and photometric campaign on the prototype of black hole low-mass X-ray binary A0620-00. We find that for each observation epoch, the extra optical flux beyond a pure ellipsoidal modulation is positively correlated with the fraction of veiling emission, indicating the accretion disk contributes most of the non-ellipsoidal variations. Meanwhile, we also obtain a K2V spectral classification of the companion, as well as the measurements of the companion's rotational velocity $v \sin i = 83.8\pm1.9$ km s$^{-1}$ and the mass ratio between the companion and the black hole $q=0.063\pm0.004$.

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