A catalog of early-type emission-line stars and H alpha line profiles from LAMOST DR2
A catalog of early-type emission-line stars and H alpha line profiles from LAMOST DR2
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LAMOST DR2 的早期型发射线恒星和 H α 线剖面目录
DOI：
10.1088/1674-4527/16/9/138
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发表时间：
2016
影响因子：
1.8
通讯作者：
Hou Yong-Hui
中科院分区：
文献类型：
--
作者：
Hou Wen;Luo A-Li;Hu Jing-Yao;Yang Hai-Feng;Du Chang-De;Liu Chao;Lee Chien-De;Lin Chien-Cheng;Wang Yue-Fei;Zhang Yong;Cao Zi-Huang;Hou Yong-Hui
本文给出了一个包含10436颗早型发射线恒星的11204条光谱的星表，其中9752条是新发现的。对于这些早期型发射线星，我们讨论了它们的低分辨率光谱的形态和物理性质。在这个光谱样本中，Hα发射曲线显示出各种各样的形状。根据Hα谱线的特征，将其分为5类：单峰发射、吸收中的单峰发射、双峰发射、吸收中的双峰发射和P-Cygni谱线。为了更好地理解Hα谱线的成因，我们从物理分类的角度将这些天体分为四类：经典Be星、Herbig Ae/Be星、密近双星和光谱被H α区污染。大多数Herbig Ae/Be星和经典Be星被识别和分离使用（HK，K-W1）色-色图。我们还讨论了31个二进制系统中列出的SIMBAD在线目录，并确定3600光谱污染的H-区域后，交叉匹配的位置在Dubout-Crillon目录。然后对谱线轮廓与分类进行统计分析，以了解我们样本中每种类型的Hα轮廓分布。最后，我们还提供了一个表的172个光谱与Fe的发射线和粗略计算的恒星风速度的7个光谱与P-Cygni的配置文件。
We present a catalog including 11 204 spectra of 10 436 early-type emission-line stars from LAMOST DR2, among which 9752 early-type emission-line spectra are newly discovered. For these early-type emission-line stars, we discuss the morphological and physical properties of their low-resolution spectra. In this spectral sample, the Hα emission profiles display a wide variety of shapes. Based on the Hα line profiles, these spectra are categorized into five distinct classes: single-peak emission, single-peak emission in absorption, double-peak emission, double-peak emission in absorption, and P-Cygni profiles. To better understand what causes the Hα line profiles, we divide these objects into four types from the perspective of physical classification, which include classical Be stars, Herbig Ae/Be stars, close binaries and spectra contaminated by H Π regions. The majority of Herbig Ae/Be stars and classical Be stars are identified and separated using a (HK, K-W1) color-color diagram. We also discuss 31 binary systems that are listed in the SIMBAD on-line catalog and identify 3600 spectra contaminated by H Π regions after cross-matching with positions in the Dubout-Crillon catalog. A statistical analysis of line profiles versus classifications is then conducted in order to understand the distribution of Hα profiles for each type in our sample. Finally, we also provide a table of 172 spectra with Fe Π emission lines and roughly calculate stellar wind velocities for seven spectra with P-Cygni profiles.