Helium-rich hot subdwarfs and single low-mass white dwarfs: formation mechanisms and further implications

	Helium-rich hot subdwarfs and single low-mass white dwarfs: formation mechanisms and further implications
	Justham, S 1,2; Podsiadlowski, P 2; Han ZW(韩占文)3 ; Wolf, C 2
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2010-10
卷号	329 期号:1-2 页码:3-10
关键词	Subdwarfs White dwarfs Supernovae Binaries: close
ISSN号	0004-640X
通讯作者	Justham, S (reprint author), Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China.
产权排序	第一完成单位
英文摘要	Variations in the mass loss from single stars have been used to explain the existence of hot subdwarf stars and the existence of single low-mass white dwarfs (LMWDs). Hence remaining uncertainty in mass loss from single red-giant stars is important to the understanding of these problems. However, natural formation channels for hot subdwarfs and single LMWDs have also been proposed which do not rely on unexplained mass loss from single red-giant stars. We outline these, and discuss how the different mechanisms could be distinguished. For example, a formation channel for single LMWDs which involves the break-up of a binary system by a type Ia supernova should produce a population of single LMWDs with a distinct kinematic signature. If that population is found to exist, it could be used to study one of the popular single-degenerate formation channels for type Ia supernovae in a previously impossible way. In addition, we examine the formation of helium-rich sdO stars-which are shown to emerge from one of the previously existing binary formation channels for hot subdwarfs. Both the SN Ia formation mechanism for single LMWDs and the formation channel for He-sdOs are a natural consequence of existing models. Hence if these formation channels do not work at all, then the result is a significant one.
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]	LATE STELLAR EVOLUTION ; IA PROGENITOR SURVEY ; B-STARS ; SDB STARS ; DIFFERENT METALLICITIES ; ATMOSPHERIC PARAMETERS ; HORIZONTAL-BRANCH ; 2ND PARAMETER ; RS OPHIUCHI ; O-STARS
收录类别	SCI
原文出处	http://link.springer.com/article/10.1007%2Fs10509-010-0341-y
语种	英语
WOS记录号	WOS:000282823200002
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4484]
专题	云南天文台_大样本恒星演化研究组
作者单位	1.The Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, China 2.Sub-department of Astrophysics, Oxford University, Oxford, UK 3.National Astronomical Observatories/Yunnan Observatory, The Chinese Academy of Sciences, Kunming, China
推荐引用方式 GB/T 7714	Justham, S,Podsiadlowski, P,Han ZW,et al. Helium-rich hot subdwarfs and single low-mass white dwarfs: formation mechanisms and further implications[J]. ASTROPHYSICS AND SPACE SCIENCE,2010,329(1-2):3-10.
APA	Justham, S,Podsiadlowski, P,Han ZW,&Wolf, C.(2010).Helium-rich hot subdwarfs and single low-mass white dwarfs: formation mechanisms and further implications.ASTROPHYSICS AND SPACE SCIENCE,329(1-2),3-10.
MLA	Justham, S,et al."Helium-rich hot subdwarfs and single low-mass white dwarfs: formation mechanisms and further implications".ASTROPHYSICS AND SPACE SCIENCE 329.1-2(2010):3-10.