Abstract

The results of the analysis of photometric and spectral monitorings of the recurrent symbiotic nova T CrB, carried out using the low-resolution spectrograph TDS of the 2.5-m telescope and the CCD photometer of the 0.6-m telescope of the CMO SAI, are presented. It is shown that the fluxes in the emission lines H\(\alpha\), H\(\beta\), He I \(\lambda\) 5876 change by 6–16\(\%\), and in the emission line He II \(\lambda\) 4686 by about 60\(\%\) on timescales of 20–60 minutes. The line flux curves on August 25, 2020 are similar to the \(B\) light curve of T CrB, but with a time delay of up to 600 s for different lines. The observed spectrum is approximated by the radiation of the system components with the following parameters: a red giant of spectral type M4 III, a nebula with \(T_{e}=10^{4}\) K and emission measure of \(4\times 10^{58}\) cm\({}^{-3}\), and the accretion disk with \(R_{1}=0.003R_{\odot}\), \(R_{\textrm{out}}\approx 1R_{\odot}\) (at inclination \(i=57^{\circ}\)).

中文翻译：

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北冕座的快速光谱变化

摘要

介绍了利用 CMO SAI 2.5 米望远镜的低分辨率摄谱仪 TDS 和 0.6 米望远镜的 CCD 光度计对复发共生新星 T CrB 进行光度和光谱监测的分析结果。结果表明，发射线 H \(\alpha\)、 H \(\beta\)、He I \(\lambda\) 5876 中的通量变化了 6–16 \(\%\)，并且在在 20-60 分钟的时间尺度上，发射线 He II \(\lambda\) 4686 大约增加了 60 \(\%\) 。2020年8月25日的线通量曲线与T CrB的\(B\)光变曲线相似，但不同线的时间延迟高达600 s。观测到的光谱由具有以下参数的系统组件的辐射来近似：光谱类型 M4 III 的红巨星、具有\(T_{e}=10^{4}\) K的星云和发射测量\( 4\times 10^{58}\) cm \({}^{-3}\)，吸积盘为\(R_{1}=0.003R_{\odot}\)、\(R_{\textrm {out}}\approx 1R_{\odot}\)（倾斜度\(i=57^{\circ}\)）。