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题名:
A new stellar spectrum interpolation algorithm and its application to Yunnan-III evolutionary population synthesis models
作者: 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
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2018-05-01
卷号: 476, 期号:3, 页码:4071-4084
DOI: 10.1093/mnras/sty373
学科分类: 天文学
产权排序: 第1完成单位
收录类别: SCI
通讯作者: Cheng LT(程连涛), Email: chengliantao@ynao.ac.cn ; Zhang FH(张奉辉), Email: zhangfh@ynao.ac.cn
关键词: methods: numerical ; stars: fundamental parameters ; globular clusters: general
英文摘要: 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.
项目资助者: Chinese Natural Science Foundation(11573062, 11373063, 11273053, 11390374, 1152100017, 11403092) ; YIPACAS Foundation(2012048) ; Yunnan Foundation(2011CI053)
语种: 英语
原文出处: 查看原文
ISSN号: 0035-8711
文章类型: Article
WOS标题词: Science & Technology ; Physical Sciences
研究领域[WOS]: Astronomy & Astrophysics
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: NEWTON-TELESCOPE LIBRARY ; INITIAL MASS FUNCTION ; ATMOSPHERIC PARAMETERS ; LUMINOSITY FUNCTION ; EMPIRICAL SPECTRA ; RESOLUTION ; METALLICITY ; CALIBRATION ; GALAXIES ; STARS
WOS记录号: WOS:000430944100081
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12364
Appears in Collections:大样本恒星演化研究组_期刊论文
中国科学院天体结构与演化重点实验室_期刊论文

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作者单位: 1.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

Recommended Citation:
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.
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