Evolutionary population synthesis for binary stellar population at high spectral resolution: integrated spectral energy distributions and absorption-feature indices

	Evolutionary population synthesis for binary stellar population at high spectral resolution: integrated spectral energy distributions and absorption-feature indices
	Zhang FH(张奉辉); Li LF(李立芳); Han ZW(韩占文)
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2005-12-01
卷号	364 期号:2 页码:503-514
关键词	binaries : general stars : evolution galaxies : clusters general
ISSN号	0035-8711
通讯作者	Zhang, FH (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Using evolutionary population synthesis, we present high-resolution (0.3 angstrom) integrated spectral energy distributions from 3000 to 7000 angstrom and absorption-line indices defined by the Lick Observatory Image Dissector Scanner (Lick/IDS) system, for an extensive set of instantaneous-burst binary stellar populations with binary interactions. The ages of the populations are in the range 1-15 Gyr and the metallicities are in the range 0.004-0.03. These high-resolution synthesis results can satisfy the needs of modern spectroscopic galaxy surveys, and are available on request. By comparing the synthetic continuum of populations at high and low resolution, we show that there is good agreement for solar metallicity and tolerable disagreement for non- solar metallicity. The strength of the Balmer lines at high spectral resolution is greater than that at low resolution for all metallicities. The comparison of Lick/IDS absorption-line indices at low and high resolution, both of which are obtained by the fitting functions, shows that the discrepancies in all indices except for TiO1 and TiO2 are insignificant for populations with Z = 0.004 and 0.02. The high-resolution Ca4227, Fe5015 and Mg-b indices are redder than the corresponding low-resolution ones for populations with Z = 0.01 and 0.03; this effect lowers the derived age and metallicity of the population. The high-resolution Mg-1, Fe5709 and Fe5782 indices are bluer than those at low resolution; this effect raises the age and metallicity. The discrepancy in these six indices is greater for populations with Z = 0.03 in comparison to Z = 0.01. At high resolution we compare the Lick/IDS spectral absorption indices obtained by using the fitting functions with those measured directly from the synthetic spectra. We find that the Ca4455, Fe4668, Mg-b and Na D indices obtained by the use of the fitting functions are redder for all metallicities, Fe5709 is redder at Z = 0.03 and becomes bluer at Z = 0.01 and 0.004, and the other indices are bluer for all metallicities than the corresponding values measured directly from the synthetic spectra.
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]	MASS-RATIO DISTRIBUTION ; SPECTROSCOPIC BINARIES ; MODEL ATMOSPHERES ; LIBRARY ; STARS ; ANGSTROM ; CALIBRATION
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/364/2/503
语种	英语
WOS记录号	WOS:000233307700011
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4413]
专题	云南天文台_大样本恒星演化研究组
作者单位	National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan Province, 650011, China
推荐引用方式 GB/T 7714	Zhang FH,Li LF,Han ZW. Evolutionary population synthesis for binary stellar population at high spectral resolution: integrated spectral energy distributions and absorption-feature indices[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,364(2):503-514.
APA	Zhang FH,Li LF,&Han ZW.(2005).Evolutionary population synthesis for binary stellar population at high spectral resolution: integrated spectral energy distributions and absorption-feature indices.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,364(2),503-514.
MLA	Zhang FH,et al."Evolutionary population synthesis for binary stellar population at high spectral resolution: integrated spectral energy distributions and absorption-feature indices".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 364.2(2005):503-514.