Spectroscopic properties of the dwarf nova-type cataclysmic variables observed by LAMOST
Spectroscopic properties of the dwarf nova-type cataclysmic variables observed by LAMOST
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LAMOST 观测到的矮新星型灾变变星的光谱特性
DOI：
10.1093/pasj/psaa065
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发表时间：
2020
影响因子：
2.3
通讯作者：
Zhi Qijun
中科院分区：
文献类型：
--
作者：
Han Zhongtao;Boonrucksar Soonthornthum;Qian Shengbang;Fang Xiaohui;Wang Qishan;Zhu Liying;Dong Aijun;Zhi Qijun
给出了LAMOST观测的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个体系被SDSS观察到，它们的大部分光谱与SDSS光谱相似。V367 Peg和V537 Peg这两个对象是该对象的第一个光谱。V367Peg的光谱由M型供体贡献，结合其轨道周期可估计其光谱类型为M3-5。在四颗低吸积率的WZSGE恒星上，可以清楚地看到白矮星光谱的特征。文中还指出和讨论了其他值得进一步观察的特殊光谱特征。我们给出了爆发的矮新星的LAMOST光谱地图集。文中给出了6个天体的首次爆发谱，并与已发表的爆发谱进行了比较。我们认为，这些数据将有助于进一步研究吸积盘的性质。在7颗矮新星的爆发光谱中可以发现He IIλ4686发射线。这些天体是探测吸积盘螺旋不对称性的极佳候选者。
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. Two objects, V367 Peg and V537 Peg, are the first spectra of the object. The spectrum of V367 Peg shows a contribution from an M-type donor and its spectral type could be estimated as M3-5 by combining its orbital period. The signature of a 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. Six objects have their first outburst spectra given here, 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 He ii λ4686 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.