Spectroscopically Identified Cataclysmic Variables from the LAMOST Survey. I. The Sample

被引：23
|
作者：
Hou, Wen [1 ]
Luo, A-li [1 ,2 ,3 ,4 ,5 ]
Li, Yin-Bi [1 ]
Qin, Li [1 ,2 ,3 ,4 ]
机构：
[1] Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Dezhou Univ, Sch Informat Management, Dezhou 253023, Peoples R China
[4] Dezhou Univ, Inst Astron Sci, Dezhou 253023, Peoples R China
[5] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
来源：
ASTRONOMICAL JOURNAL | 2020年 / 159卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Cataclysmic variable stars; Dwarf novae; Nova-like variable stars; Catalogs; Astronomy data analysis; DIGITAL SKY SURVEY; HIGH-SPEED PHOTOMETRY; DATA RELEASE; DWARF NOVAE; CATALOG; ATLAS; TARGETS; VII;
D O I：
10.3847/1538-3881/ab5962
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A sample of cataclysmic variables (CVs) is presented including spectroscopically identified 380 spectra of 245 objects, of which 58 CV candidates are new discoveries. The BaggingTopPush and the Random Forest algorithms are applied to the Fifth Data Release (DR5) of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) to retrieve CVs with strong emission lines and with broad absorption lines respectively. Based on spectroscopic classification, 134 dwarf novae, 41 nova-like variables, and 19 magnetic CVs are identified from the sample. In addition, 89 high-inclination systems and 33 CVs showing companion stars are recognized and discussed for their distinct spectral characteristics. Comparisons between CVs from LAMOST and from published catalogs are made in spatial and magnitude distribution, and the difference of their locus in the Gaia color-absolute magnitude diagram (CaMD) are also investigated. More interestingly, for two dwarf novae observed through LAMOST and SDSS in different epochs, their spectra both in quiescence phase and during outburst are exhibited.
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页数：18
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