论文标题
Ultracool矮人在Lamost DR7中使用光谱识别
Ultracool dwarfs identified using spectra in LAMOST DR7
论文作者
论文摘要
在这项工作中，我们识别出具有光谱类型的M6或更高版本的734个Ultracool矮人，包括1个L0。在该样本中，首次对625个进行了光谱研究。所有这些Ultracool矮人都在360〜PC之内，\ textit {gaia} g幅度比〜19.2 mag亮。 By studying the spectra and checking their stellar parameters (Teff, logg, and [FeH] derived with the LAMOST pipeline, we found their cool red nature and their metallicity to be consistent with the nature of Galactic thin-disk objects. Furthermore, 77 of them show lithium absorption lines at 6708A, further indicating their young ages and substellar nature. Kinematics obtained through LAMOST radial速度以及Gaia EDR3的适当运动和视差数据也表明，我们的大多数目标是通过速度分散速度和一定人群的平均年龄之间的关系来估计运动年龄。
In this work, we identify 734 ultracool dwarfs with a spectral type of M6 or later, including one L0. Of this sample, 625 were studied spectroscopically for the first time. All of these ultracool dwarfs are within 360~pc, with a \textit{Gaia} G magnitude brighter than ~19.2 mag. By studying the spectra and checking their stellar parameters (Teff, logg, and [FeH] derived with the LAMOST pipeline, we found their cool red nature and their metallicity to be consistent with the nature of Galactic thin-disk objects. Furthermore, 77 of them show lithium absorption lines at 6708A, further indicating their young ages and substellar nature. Kinematics obtained through LAMOST radial velocities, along with the proper motion and parallax data from Gaia EDR3, also suggest that the majority of our targets are thin-disk objects. Kinematic ages were estimated through the relationship between the velocity dispersion and the average age for a certain population. Moreover, we identified 35 binaries, with 6 of them reported as binaries for the first time.
