With our robotic 1.2 m TIGRE telescope, we were able to obtain eight optical spectra with intermediate resolution (R = 20,000) of the Nova V659 Sct during different phases of its outburst. We present a list of the lines found in the Nova spectra. The most common features are H I, O I, Na I, Fe II and Ca II. Studying the spectral evolution of the strong features we found that the absorption features move to higher expansion velocities before disappearing and the emission features show (different) asymmetries. Thanks to the intermediate spectral resolution we identified and analysed the interstellar medium absorption features present in the spectra. We detected atomic absorption features of Na I and Ca II. The sodium D lines show more complex substructures with three main absorption features at around a velocity of -10, 30 and 85 km/s. We identified several DIBs in the Nova V659 Sct spectra and determined their velocities and equivalent widths.

中文翻译：

---

Nova V659 Sct 光谱的时间序列

使用我们的机器人 1.2 m TIGRE 望远镜，我们能够在 Nova V659 Sct 爆发的不同阶段获得八个中等分辨率（R = 20,000）的光谱。我们列出了在 Nova 光谱中发现的谱线。最常见的特征是 HI、OI、Na I、Fe II 和 Ca II。研究强特征的光谱演变，我们发现吸收特征在消失之前移动到更高的膨胀速度，并且发射特征显示出（不同的）不对称性。由于中等光谱分辨率，我们识别并分析了光谱中存在的星际介质吸收特征。我们检测到 Na I 和 Ca II 的原子吸收特征。钠 D 线显示了更复杂的子结构，在 -10、30 和 85 公里/秒的速度附近具有三个主要吸收特征。