Spectra of 76 known dwarf novae from the LAMOST survey were presented. Most of the objects were observed in quiescence, and about 16 systems have typical outburst spectra. 36 of these systems were observed by SDSS, and most of their spectra are similar to the SDSS spectra. 2 objects, V367 Peg and V537 Peg, are the first to observe their spectra. The spectrum of V367 Peg shows a contribution from a M-type donor and its spectral type could be estimated as M3-5 by combining its orbital period. The signature of white dwarf spectrum can be seen clearly in four low-accretion-rate WZ Sge stars. Other special spectral features worthy of further observations are also noted and discussed. We present a LAMOST spectral atlas of outbursting dwarf novae. 6 objects have the first outburst spectra, and the others were also compared with the published outburst spectra. We argue that these data will be useful for further investigation of the accretion disc properties. The HeII $\lambda$4686 emission line can be found in the outburst spectra of seven dwarf novae. These objects are excellent candidates for probing the spiral asymmetries of accretion disc.

中文翻译：

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LAMOST观测到的矮新星型激变变量的光谱特性

展示了来自 LAMOST 调查的 76 颗已知矮新星的光谱。大多数天体是在静止状态下观测到的，大约有 16 个系统具有典型的爆发光谱。其中 36 个系统被 SDSS 观测到，它们的大部分光谱与 SDSS 光谱相似。2 个物体，V367 Peg 和 V537 Peg，是第一个观察到它们光谱的物体。V367 Peg 的光谱显示了来自 M 型供体的贡献，通过结合其轨道周期可以估计其光谱类型为 M3-5。在四颗低吸积率 WZ Sge 恒星中可以清楚地看到白矮星光谱的特征。还注意到和讨论了其他值得进一步观察的特殊光谱特征。我们展示了爆发的矮新星的 LAMOST 光谱图谱。6个天体有第一次爆发光谱，其他的也与公开的爆发光谱进行了比较。我们认为这些数据将有助于进一步研究吸积盘的特性。HeII $\lambda$4686 发射线可以在七个矮新星的爆发光谱中找到。这些物体是探测吸积盘螺旋不对称性的绝佳候选者。