New high resolution, optical spectroscopy of the high mass X-ray binary LMC X-3, shows the spectral type of the donor star changes with phase due to irradiation by the X-ray source. We find the spectral type is likely to be B5V, and only appears as B3V when viewing the heated side of the donor. Combining our measurements with those previously published, and taking into account the effects of X-ray irradiation, results in a value for the donor star radial velocity semi-amplitude of Ko = 256.7 ± 4.9 km s?1. We find the mass of the black hole lies in the range 9.5M MX 13.6M.
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机译：新的高分辨率，高质量X射线二元LMC X-3的光谱意见，显示了由于X射线源照射引起的供体之星变化的光谱型。我们发现光谱类型很可能是B5V，并且在观察供体的加热侧时只出现为B3V。将我们的测量结果与先前发表的那些相结合，并考虑到X射线照射的影响，导致施主星径向速度半幅度的值= 256.7±4.9 km s？1。我们发现黑洞的质量位于9.5米MX 13.6M的范围内。
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