恒星低质量光谱的连续谱拟合方法

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	恒星低质量光谱的连续谱拟合方法
	吴明磊 1; 潘景昌 1; 衣振萍 1; 韦鹏 2
刊名	光谱学与光谱分析
	2018
卷号	38 期号:3 页码:963
ISSN号	1000-0593
英文摘要	The stellar continuum is a sort of spectrum whose light intensity changes continuously and smoothly with wavelength (frequency) due to blackbody radiation. Each observed spectrum contains continuous spectra, spectral lines and noises. The classification of stellar is mainly based on the spectral lines of the spectrum, relative intensity of the continuum and other characteristics of the spectrum. The distribution of the stellar continuum and the contour of the lines are determined by the stellar atmospheric parameter, so the stellar atmospheric parameter can be estimated from the continuum and the spectral lines. Therefore, the main problem of the spectral data processing is to extract the continuum and the lines. The current algorithms for stellar continuous spectral extraction are mainly polynomial approximation, median filtering, morphological filtering and wavelet filtering. However, these methods for the robustness of low-quality spectral processing are not very satisfying. Therefore, it is necessary to study a new algorithm for extracting the continuous spectrum from the low-quality spectra. In this paper, a fitting method for low-quality stellar spectrum based on Monte Carlo is proposed after careful analyses of low-quality stellar continuum. The method is used to automatically interpolate at the point where the spectrum is not in the range of the star spectrum with Monte Carlo, so each wavelength corresponds to a flow point, and then the low-order polynomial iterations are fitted to these flow points for obtaining the continuous spectrum. In order to verify the robustness of the algorithm for low-quality spectral continuum extraction with different SNRs, we use different SNRs to simulate different low-quality spectrum by adding different Gaussian white noise to the original spectrum. The result shows that the proposed algorithm has high accuracy and robustness to the fitting of low-quality spectrum with different SNRs.
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/53055]
专题	中国科学院国家天文台
作者单位	1.山东大学 2.中国科学院国家天文台
推荐引用方式 GB/T 7714	吴明磊,潘景昌,衣振萍,等. 恒星低质量光谱的连续谱拟合方法[J]. 光谱学与光谱分析,2018,38(3):963.
APA	吴明磊,潘景昌,衣振萍,&韦鹏.(2018).恒星低质量光谱的连续谱拟合方法.光谱学与光谱分析,38(3),963.
MLA	吴明磊,et al."恒星低质量光谱的连续谱拟合方法".光谱学与光谱分析 38.3(2018):963.