How binary interactions affect spectral stellar population synthesis

	How binary interactions affect spectral stellar population synthesis
	Li ZM(李忠木)1,2 ; Han ZW(韩占文)1
刊名	ASTROPHYSICAL JOURNAL
	2008-09-20
卷号	685 期号:1 页码:225-234
关键词	galaxies : elliptical and lenticular, cD galaxies : stellar content
ISSN号	0004-637X
通讯作者	Li, ZM (reprint author), Chinese Acad Sci, Grad Univ, Beijing 100864, Peoples R China.
产权排序	第一完成单位
英文摘要	Single-star stellar population (ssSSP) models are usually used for spectral stellar population studies. However, more than 50% of stars are in binaries and evolve differently from single stars. This suggests that the effects of binary interactions should be considered when modeling the stellar populations of galaxies and star clusters. Via a rapid spectral stellar population synthesis model, we give detailed studies of the effects of binary interactions on the Lick indices and colors of stellar populations and on the determination of the stellar ages and metallicities of populations. Our results show that binary interactions make stellar populations less luminous and bluer, with larger age-sensitive Lick indices (H beta) and smaller metallicity-sensitive indices (e. g., Mg b, Fe5270, and Fe5335) compared to ssSSPs. It also shows that when ssSSP models are used to determine the ages and metallicities of stellar populations, smaller ages or metallicities are obtained when using two line indices (H beta and [MgFe]) or two colors (e. g., u - R and R - K), respectively. Some relations for linking the stellar population parameters obtained by ssSSPs to those obtained by binary-star stellar populations (bsSSPs) are presented in this work. This can help us get some absolute values for stellar population parameters and is useful for absolute studies. However, it is found that the relative luminosity-weighted stellar ages and metallicities obtained via ssSSPs and bsSSPs are similar. This suggests that ssSSPs can be used for most spectral stellar population studies, except in some special cases.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ABSORPTION-FEATURE INDEXES ; MASS-RATIO DISTRIBUTION ; EARLY-TYPE GALAXIES ; SPECTROSCOPIC BINARIES ; EVOLUTIONARY SYNTHESIS ; OPEN CLUSTERS ; STARS ; RESOLUTION ; MODEL ; METALLICITY
收录类别	SCI
原文出处	http://iopscience.iop.org/0004-637X/685/1/225/
语种	英语
WOS记录号	WOS:000259314200017
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4447]
专题	云南天文台_大样本恒星演化研究组
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Graduate University of the Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Li ZM,Han ZW. How binary interactions affect spectral stellar population synthesis[J]. ASTROPHYSICAL JOURNAL,2008,685(1):225-234.
APA	Li ZM,&Han ZW.(2008).How binary interactions affect spectral stellar population synthesis.ASTROPHYSICAL JOURNAL,685(1),225-234.
MLA	Li ZM,et al."How binary interactions affect spectral stellar population synthesis".ASTROPHYSICAL JOURNAL 685.1(2008):225-234.