The formation of hot subdwarf stars and its implications for the UV-upturn phenomenon of elliptical galaxies

doi:10.1007/s10509-010-0348-4

YNAO OpenIR > 大样本恒星演化研究组

	The formation of hot subdwarf stars and its implications for the UV-upturn phenomenon of elliptical galaxies
	Han ZW(韩占文)1,2 ; Podsiadlowski, P 3; Lynas-Gray, A 3; Han, Z (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊	ASTROPHYSICS AND SPACE SCIENCE
	2010-10
卷号	329 期号:1-2 页码:41-48
DOI	10.1007/s10509-010-0348-4
产权排序	第1完成单位
收录类别	SCI
关键词	Stars: Subdwarfs Stars: Horizontal Branch Binaries: Close Globular Cluster: General Galaxies: Elliptical And Lenticular Cd Galaxies: Starburst Ultraviolet: Galaxies
摘要	In this paper, we review the formation scenario for field hot subdwarf stars and extreme horizontal branch stars in globular clusters and discuss how the scenario helps us to understand the UV-upturn phenomenon of elliptical galaxies. It is widely accepted that field hot subdwarf stars originate from binary evolution via the following three channels, common envelope evolution channel for hot subdwarf binaries with short orbital periods, stable Roche lobe overflow channel for hot subdwarf binaries with long orbital periods, and the double helium white dwarf merger channel for single hot subdwarfs. Such a scenario can also explain the lack of binarity of extreme horizontal branch stars in globular clusters. We have applied, in an a priori way, the scenario to the study of UV-upturn phenomenon of elliptical galaxies via an evolutionary population synthesis approach and found that the UV-upturn can be naturally explained. This has major implications for understanding the evolution of UV-upturn and elliptical galaxies in general. In particular, it implies that the UV-upturn is not a sign of age, as had been postulated previously, and should not be strongly dependent on the metallicity of the population, but exists universally from dwarf ellipticals to giant ellipticals. The above a priori UV-upturn model is supported by recent GALEX observations and has been applied to naturally explain the colours of both dwarf ellipticals and giant ellipticals without the requirement of dichotomy between their stellar population properties.
项目资助者	Natural Science Foundation of China [10821061] ; 973 project [2007CB815406] ; Chinese Academy of Sciences [KJCX2-YW-T24]
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-640X
URL	查看原文
归档日期	2010-10-20
WOS记录号	WOS:000282823200008
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	HORIZONTAL-BRANCH STARS ; FAR-ULTRAVIOLET EMISSION ; STANDARD STELLAR LIBRARY ; B-STARS ; GLOBULAR-CLUSTERS ; EVOLUTIONARY SYNTHESIS ; POPULATION SYNTHESIS ; BINARY FRACTION ; VIRGO CLUSTER ; EHB BINARIES
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4487
专题	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
通讯作者	Han, Z (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011, China 2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China 3.Department of Physics, University of Oxford, Keble Road, Oxford, OX1 3RH, UK
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Han ZW,Podsiadlowski, P,Lynas-Gray, A,et al. The formation of hot subdwarf stars and its implications for the UV-upturn phenomenon of elliptical galaxies[J]. ASTROPHYSICS AND SPACE SCIENCE,2010,329(1-2):41-48.
APA	Han ZW,Podsiadlowski, P,Lynas-Gray, A,&Han, Z .(2010).The formation of hot subdwarf stars and its implications for the UV-upturn phenomenon of elliptical galaxies.ASTROPHYSICS AND SPACE SCIENCE,329(1-2),41-48.
MLA	Han ZW,et al."The formation of hot subdwarf stars and its implications for the UV-upturn phenomenon of elliptical galaxies".ASTROPHYSICS AND SPACE SCIENCE 329.1-2(2010):41-48.

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