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arXiv 2211.04518astro-ph.HEastro-ph.SR
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一个新的X射线候选双星黑洞HD96670的光学分析和模型

Optical Analysis and Modeling of HD96670, a new Black Hole X-ray Binary Candidate

Sebastian Gomez, Jonathan E. Grindlay

摘要:

我们报告HD 96670,在船底座OB 2协会的单线光谱二进制的光学观测和建模。我们收集了10个时期的光谱学,并在17个非连续的夜晚对光源进行测光。我们构造了一个径向速度曲线的光谱,并更新的轨道周期为$P = 5.28388 \pm 0.00046$天。光谱显示了氧和氦的吸收,与O型原色一致。我们没有看到来自双星中第二颗恒星的谱线的证据。我们使用Wilson-Devinney代码同时模拟光学光变曲线和径向速度曲线,并找到最佳拟合质量$M_1 = 22.7^{+5.2}_{-3.6} M_\odot$的主要,和$M_2 = 6.2^{+0.9}_{-0.7} M_\odot$的次要。这种质量的物体与B型恒星或黑洞一致。考虑到我们没有看到次级的吸收线,结合观测到的硬幂律X射线光谱与$Γ= 2.6$检测到超过10千电子伏,可能产生的风吸积到次级,我们得出结论,次级最有可能是一个黑洞。我们看到了不对称的氦线,其形状与第三颗恒星的存在一致。如果次级双星确实是一个黑洞,这个系统将增加到星系中只有四个可能的黑洞高质量X射线双星的小样本。

英文摘要:

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.

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