论文标题
B星的光谱分类：使用SDSS-IV/Apogee近IR数据的经验序列
Spectral classification of B stars: The empirical sequence using SDSS-IV/APOGEE near-IR data
论文作者
论文摘要
我们使用SDSS apogee2-N DR14数据库的近红外光谱（1.5-1.7 $ $ m）为正常B型恒星提供了半经验光谱分类方案。与B型恒星合作的主要动机是它们在年轻恒星群集的演变中的重要性，但是我们还利用了ApoGee2-N中的B型明星候选者的大量样本（316颗恒星），为此，我们还进行了光学（3600-9100 \\\\\\\\\\\\\\\\\\\\\\\\\\之遥）通过首先使用Lamost DR3光谱和规范光谱分类方案Grey＆Corbally 2009获得源的准确光谱分类，我们发现光谱类型与ApogeeT系列中Brackett系列的氢线的等效宽度之间存在线性关系。这种关系从Roman-Lopes等人发现的O和早期B恒星的类似关系中顺利进行。 （2018）。这样，我们获得了具有光学和NIR特征的B型源的目录，并且分类方案完善了到一个光谱子类。
We present a semi-empirical spectral classification scheme for normal B-type stars using near-infrared spectra (1.5-1.7 $μ$m) from the SDSS APOGEE2-N DR14 database. The main motivation for working with B-type stars is their importance in the evolution of young stellar clusters, however we also take advantage of having a numerous sample (316 stars) of B-type star candidates in APOGEE2-N, for which we also have optical (3600-9100 \angstrom) counterparts from the LAMOST survey. By first obtaining an accurate spectral classification of the sources using the LAMOST DR3 spectra and the canonical spectral classification scheme Gray & Corbally 2009, we found a linear relation between optical spectral types and the equivalent widths of the hydrogen lines of the Brackett series in the APOGEE2-N NIR spectra. This relation extends smoothly from a similar relation for O and early-B stars found by Roman-Lopes et al. (2018). This way, we obtain a catalog of B-type sources with features in both the optical and NIR, and a classification scheme refined down to one spectral sub-class.
