Derivative Spectroscopy and its Application at Detecting the Weak Emission/Absorption Lines

doi:10.1088/1674-4527/ad1047

	Derivative Spectroscopy and its Application at Detecting the Weak Emission/Absorption Lines
	Yu LH(于立欢)1; Li JD(李江丹)1; Wang JL(王锦良)1; Li JJ(李佳佳)1; Li, Jiao 2; Xi Q(席强)1; Han ZW(韩占文)1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2024-03-01
卷号	24 期号:3
关键词	line: identification line: profiles methods: data analysis techniques: spectroscopic techniques: radial velocities
ISSN号	1674-4527
DOI	10.1088/1674-4527/ad1047
产权排序	第1完成单位
文献子类	Article
英文摘要	The development of spectroscopic survey telescopes like Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), Apache Point Observatory Galactic Evolution Experiment and Sloan Digital Sky Survey has opened up unprecedented opportunities for stellar classification. Specific types of stars, such as early-type emission-line stars and those with stellar winds, can be distinguished by the profiles of their spectral lines. In this paper, we introduce a method based on derivative spectroscopy (DS) designed to detect signals within complex backgrounds and provide a preliminary estimation of curve profiles. This method exhibits a unique advantage in identifying weak signals and unusual spectral line profiles when compared to other popular line detection methods. We validated our approach using synthesis spectra, demonstrating that DS can detect emission signals three times fainter than Gaussian fitting. Furthermore, we applied our method to 579,680 co-added spectra from LAMOST Medium-Resolution Spectroscopic Survey, identifying 16,629 spectra with emission peaks around the H alpha line from 10,963 stars. These spectra were classified into three distinct morphological groups, resulting in nine subclasses as follows. (1) Emission peak above the pseudo-continuum line (single peak, double peaks, emission peak situated within an absorption line, P Cygni profile, Inverse P Cygni profile); (2) Emission peak below the pseudo-continuum line (sharp emission peak, double absorption peaks, emission peak shifted to one side of the absorption line); (3) Emission peak between the pseudo-continuum line.
学科主题	天文学
URL标识	查看原文
出版地	20A DATUN RD, CHAOYANG, BEIJING, 100101, PEOPLES R CHINA
资助项目	National Natural Science Foundation of China (NSFC)[12090040/3]; National Natural Science Foundation of China (NSFC)[12125303]; National Natural Science Foundation of China (NSFC)[12288102]; National Natural Science Foundation of China (NSFC)[11733008]; National Key Research and Development Program of China[2021YFA1600401/3]; China Manned Space Project[CMS-CSST-2021-A10]; Yunnan Fundamental Research Projects[202101AV070001]; National Natural Science Foundation of China; Chinese Academy of Sciences[U1831125]; Research Program of Frontier Sciences, CAS[QYZDY-SSW-SLH007]; Chinese Academy of Sciences
WOS关键词	EMISSION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:001179643700001
资助机构	National Natural Science Foundation of China (NSFC)[12090040/3, 12125303, 12288102, 11733008] ; National Key Research and Development Program of China[2021YFA1600401/3] ; China Manned Space Project[CMS-CSST-2021-A10] ; Yunnan Fundamental Research Projects[202101AV070001] ; National Natural Science Foundation of China ; Chinese Academy of Sciences[U1831125] ; Research Program of Frontier Sciences, CAS[QYZDY-SSW-SLH007] ; Chinese Academy of Sciences
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ynao.ac.cn/handle/114a53/26551]
专题	云南天文台_大样本恒星演化研究组
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming 650011, China; Yulihuan@ynao.ac.cn, zhanwenhan@ynao.ac.cn; 2.Key Lab of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
推荐引用方式 GB/T 7714	Yu LH,Li JD,Wang JL,et al. Derivative Spectroscopy and its Application at Detecting the Weak Emission/Absorption Lines[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2024,24(3).
APA	于立欢.,李江丹.,王锦良.,李佳佳.,Li, Jiao.,...&韩占文.(2024).Derivative Spectroscopy and its Application at Detecting the Weak Emission/Absorption Lines.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,24(3).
MLA	于立欢,et al."Derivative Spectroscopy and its Application at Detecting the Weak Emission/Absorption Lines".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 24.3(2024).