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A catalog of early-type emission-line stars and H_α line profiles from LAMOST DR2
Hou Wen1; Luo Ali1; Hu Jingyao1; Yang Haifeng1; Du Changde1; Liu Chao1; Lee Chiende2; Lin Chiencheng3; Wang Yuefei4; Zhang Yong4; Cao Zihuang1; Hou Yonghui4
2016
Source PublicationResearch in Astronomy and Astrophysics
ISSN1674-4527
Volume16Issue:9Pages:138
AbstractWe 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.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/52008
Collection中国科学院国家天文台
Affiliation1.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
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
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.
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