A catalog of early-type emission-line stars and H_α line profiles from LAMOST DR2

CORC > 国家天文台 > 中国科学院国家天文台

	A catalog of early-type emission-line stars and H_α line profiles from LAMOST DR2
	Hou Wen 1; Luo Ali 1; Hu Jingyao 1; Yang Haifeng 1; Du Changde 1; Liu Chao 1; Lee Chiende 2; Lin Chiencheng 3; Wang Yuefei 4; Zhang Yong 4
刊名	Research in Astronomy and Astrophysics
	2016
卷号	16 期号:9 页码:138
ISSN号	1674-4527
英文摘要	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 earlytype emission-line stars, we discuss the morphological and physical properties of their low-resolution spectra. In this spectral sample, the H_α emission profiles display a wide variety of shapes. Based on the H_α 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 H_α 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_(II) regions. The majority of Herbig Ae/Be stars and classical Be stars are identified and separated using a (H-K, 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 HII 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 H_α profiles for each type in our sample. Finally, we also provide a table of 172 spectra with Fe II emission lines and roughly calculate stellar wind velocities for seven spectra with P-Cygni profiles.
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/52007]
专题	中国科学院国家天文台
作者单位	1.中国科学院国家天文台 2.国立中央大学 3.中国科学院上海天文台 4.中铁一局集团第五工程有限公司
推荐引用方式 GB/T 7714	Hou Wen,Luo Ali,Hu Jingyao,et al. A catalog of early-type emission-line stars and H_α line profiles from LAMOST DR2[J]. Research in Astronomy and Astrophysics,2016,16(9):138.
APA	Hou Wen.,Luo Ali.,Hu Jingyao.,Yang Haifeng.,Du Changde.,...&Hou Yonghui.(2016).A catalog of early-type emission-line stars and H_α line profiles from LAMOST DR2.Research in Astronomy and Astrophysics,16(9),138.
MLA	Hou Wen,et al."A catalog of early-type emission-line stars and H_α line profiles from LAMOST DR2".Research in Astronomy and Astrophysics 16.9(2016):138.