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A new stellar spectrum interpolation algorithm and its application to Yunnan-III evolutionary population synthesis models
Cheng LT(程连涛)1,2,3,4; Zhang FH(张奉辉)1,2,3; Kang XY(康晓宇)1,2,3; Wang L(王浪)1,2,3,4
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-05-01
Volume476Issue:3Pages:4071-4084
DOI10.1093/mnras/sty373
Contribution Rank第1完成单位
Indexed BySCI
KeywordMethods: Numerical Stars: Fundamental Parameters Globular Clusters: General
Abstract

In evolutionary population synthesis (EPS) models, we need to convert stellar evolutionary parameters into spectra via interpolation in a stellar spectral library. For theoretical stellar spectral libraries, the spectrum grid is homogeneous on the effective-temperature and gravity plane for a given metallicity. It is relatively easy to derive stellar spectra. For empirical stellar spectral libraries, stellar parameters are irregularly distributed and the interpolation algorithm is relatively complicated. In those EPS models that use empirical stellar spectral libraries, different algorithms are used and the codes are often not released. Moreover, these algorithms are often complicated. In this work, based on a radial basis function (RBF) network, we present a new spectrum interpolation algorithm and its code. Compared with the other interpolation algorithms that are used in EPS models, it can be easily understood and is highly efficient in terms of computation. The code is written in MATLAB scripts and can be used on any computer system. Using it, we can obtain the interpolated spectra from a library or a combination of libraries. We apply this algorithm to several stellar spectral libraries (such as MILES, ELODIE-3.1 and STELIB-3.2) and give the integrated spectral energy distributions (ISEDs) of stellar populations (with ages from 1 Myr to 14 Gyr) by combining them with Yunnan-III isochrones. Our results show that the differences caused by the adoption of different EPS model components are less than 0.2 dex. All data about the stellar population ISEDs in this work and the RBF spectrum interpolation code can be obtained by request from the first author or downloaded from http://www1.ynao.ac.cn/similar to zhangfh.

Funding ProjectChinese Natural Science Foundation[11573062] ; Chinese Natural Science Foundation[11373063] ; Chinese Natural Science Foundation[11273053] ; Chinese Natural Science Foundation[11390374] ; Chinese Natural Science Foundation[1152100017] ; Chinese Natural Science Foundation[11403092] ; YIPACAS Foundation[2012048] ; Yunnan Foundation[2011CI053]
Funding OrganizationChinese Natural Science Foundation[11573062, 11373063, 11273053, 11390374, 1152100017, 11403092] ; YIPACAS Foundation[2012048] ; Yunnan Foundation[2011CI053]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000430944100081
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordNEWTON-TELESCOPE LIBRARY ; INITIAL MASS FUNCTION ; ATMOSPHERIC PARAMETERS ; LUMINOSITY FUNCTION ; EMPIRICAL SPECTRA ; RESOLUTION ; METALLICITY ; CALIBRATION ; GALAXIES ; STARS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12364
Collection大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorCheng LT(程连涛); Zhang FH(张奉辉)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
4.University of Chinese Academy of Sciences, Beijing 100049, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Cheng LT,Zhang FH,Kang XY,et al. A new stellar spectrum interpolation algorithm and its application to Yunnan-III evolutionary population synthesis models[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,476(3):4071-4084.
APA Cheng LT,Zhang FH,Kang XY,&Wang L.(2018).A new stellar spectrum interpolation algorithm and its application to Yunnan-III evolutionary population synthesis models.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,476(3),4071-4084.
MLA Cheng LT,et al."A new stellar spectrum interpolation algorithm and its application to Yunnan-III evolutionary population synthesis models".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 476.3(2018):4071-4084.
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