论文标题
HD96670的光学分析和建模，新的黑洞X射线二进制候选者
Optical Analysis and Modeling of HD96670, a new Black Hole X-ray Binary Candidate
论文作者
论文摘要
我们报告了HD96670的光学观察和建模，这是Carina OB2关联中的单线光谱二进制。我们在17个非连续晚上收集了10个光谱时期，并在源上收集了光学测定。我们从光谱中构造了径向速度曲线，并将二进制的轨道周期更新为$ p = 5.28388 \ pm 0.00046 $ days。光谱显示出与O型原发性一致的氧气和氦吸收。我们没有看到二进制中次级恒星的光谱线的证据。我们使用Wilson-Devinney代码同时建模光曲线和径向速度曲线，并找到最佳拟合质量为$ m_1 = 22.7^{+5.2} _ { - 3.6} m_ \ odot $，用于主级，而$ m_2 = 6.2 = 6.2 = 6.2^{+0.9} {+0.9} _} _ { - 0.7} _ { - 0.7} =该质量的对象与B型恒星或黑洞一致。鉴于我们没有看到次级的吸收线，结合了观察到的硬幂律X射线光谱，$γ= 2.6 $检测到了10 keV，也许是由风积聚在次级上产生的，我们得出结论，次级很可能是黑洞。我们看到具有与第三颗恒星的存在相一致的形状的不对称氦气线。如果次要确实是一个黑洞，则该系统将在银河系中只有四个可能的黑洞高质量X射线二进制物中添加到小样本中。
We report on optical observations and modeling of HD96670, a single-line spectroscopic binary in the Carina OB2 association. We collected 10 epochs of optical spectroscopy, and optical photometry on 17 non-consecutive nights on the source. We construct a radial velocity curve from the spectra, and update the orbital period of the binary to be $P = 5.28388 \pm 0.00046$ days. The spectra show oxygen and helium absorption, consistent with an O-type primary. We see no evidence for spectral lines from the secondary star in the binary. We model the optical light curve and radial velocity curve simultaneously using the Wilson-Devinney code and find a best fit mass of $M_1 = 22.7^{+5.2}_{-3.6} M_\odot$ for the primary, and $M_2 = 6.2^{+0.9}_{-0.7} M_\odot$ for the secondary. An object of this mass is consistent with either a B-type star, or a black hole. Given that we see no absorption lines from the secondary, in combination with an observed hard power-law X-ray spectrum with $Γ= 2.6$ detected past 10 keV, maybe produced by wind accretion onto the secondary, we conclude that the secondary is most likely a black hole. We see asymmetrical helium lines with a shape consistent with the presence of a third star. If the secondary is indeed a black hole, this system would add to the small sample of only four possible black hole high mass X-ray binaries in the galaxy.
