论文标题
在Gaia DR2和Lamost DR8中观察到的极低质量白矮星星
Extremely low-mass white dwarf stars observed in Gaia DR2 and LAMOST DR8
论文作者
论文摘要
我们介绍了我们正在进行的项目的第一个结果，以研究极低的质量（ELM）白色矮人（WDS）（$ M $ $ $ \ leq $ 0.3 $ 0.3 $ M _ {\ sun} $），以及大型天空区域多对象光纤光谱光谱望远镜（Lamost）光谱。基于Lamost DR8光谱数据库，我们分析了从$ \ it Gaia $ dr2数据中选出的136个ELM WD候选者和ELM调查先前确定的12个已知对象。这些恒星的大气参数和径向速度是通过拟合Lamost低分辨率光谱而获得的。将这项工作的12个已知对象的大气参数与ELM调查报告的结果进行了比较之后，我们证明了杆光谱在探测ELM WDS本质中的潜力。根据大气参数和$ \ it gaia $ edr3数据，我们确定了21个新的高概率ELM WDS $ m $ $ $ $ $ $ \ leq $ 0.3 $ M _ {\ sun} $，并且AlaLax估计这同意了3个因素3。其中两个都在其中两个。包含至少一个ELM WD的系统。
We present the first results from our ongoing project to study extremely low mass (ELM) white dwarfs (WDs) ($M$ $\leq$ 0.3$M_{\sun}$) with the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) spectra. Based on the LAMOST DR8 spectral database, we analyzed 136 ELM WD candidates selected from $\it Gaia$ DR2 data and 12 known objects previously identified by the ELM Survey. The atmospheric parameters and radial velocities of these stars were obtained by fitting the LAMOST low-resolution spectra. After comparing the atmospheric parameters of the 12 known objects from this work to the results reported by the ELM Survey, we demonstrated the potential of LAMOST spectra in probing into the nature of ELM WDs. Based on the atmospheric parameters and $\it Gaia$ EDR3 data, we identified 21 new high-probability ELM WDs with masses $M$ $\leq$ 0.3$M_{\sun}$ and parallax estimates that agree to within a factor of 3. Two of them, J0338+4134 and J1129+4715, show significant radial velocity variability and are very likely to be binary systems containing at least one ELM WD.
