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arXiv 1710.04466astro-ph.HE
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基于1.5米RTT-150望远镜观测的快X射线瞬态IGR J17544-2619光学对应物的光谱研究

Spectroscopic study of the optical counterpart to the Fast X-ray Transient IGR J17544-2619 based on observations at the 1.5-m RTT-150 telescope

I. F. Bikmaev, E. A. Nikolaeva, V. V. Shimansky, A. I. Galeev, R. Ya. Zhuchkov, E. N. Irtuganov, S. S. Melnikov, N. A. Sakhibullin, S. A. Grebenev, L. M. Sharipova

摘要:

我们提出的结果,我们长期的光度和光谱观测在俄罗斯-土耳其RTT-150望远镜的光学对应的最著名的来源之一,代表类的快速X射线瞬变,IGR J17544-2619。根据我们的光学数据,我们首次用多普勒光谱方法确定了双星系统的轨道参数和物理参数。通过对选定的谱线进行非LTE修正,计算了光学对应物的理论光谱,得到了恒星大气和光学恒星的参数($T_{\rm eff}=33\,000$ K,$\log\,g=3.85$,$R=9.5\ R_{\odot},$和$M=23\ M_{\odot}$)。后者表明,光学星不是以前认为的超巨星。

英文摘要:

We present the results of our long-term photometric and spectroscopic observations at the Russian-Turkish RTT-150 telescope for the optical counterpart to one of the best-known sources, representatives of the class of fast X-ray transients, IGR J17544-2619. Based on our optical data, we have determined for the first time the orbital and physical parameters of the binary system by the methods of Doppler spectroscopy. We have computed theoretical spectra of the optical counterpart by applying non-LTE corrections for selected lines and obtained the parameters of the stellar atmosphere and the optical star ($T_{\rm eff}=33\,000$ K, $\log\,g=3.85$, $R=9.5\ R_{\odot},$ and $M=23\ M_{\odot}$). The latter suggest that the optical star is not a supergiant as has been thought previously.

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