The helium star donor channel for the progenitors of type Ia supernovae with different metallicities

	The helium star donor channel for the progenitors of type Ia supernovae with different metallicities
	Wang B(王博)1,2,3 ; Han ZW(韩占文)1,2
刊名	ASTRONOMY & ASTROPHYSICS
	2010-06
卷号	515
关键词	binaries: close supernovae: general white dwarfs stars: evolution
ISSN号	0004-6361
通讯作者	Wang, B (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Context. The nature of type Ia supernovae (SNe Ia) is still unclear. Metallicities may have an important effect on their properties. Aims. In this paper, we study the He star donor channel towards SNe Ia comprehensively and systematically at various metallicities. Methods. Employing Eggleton's stellar evolution code with the optically thick wind assumption, we calculated about 10 000 WD + He star systems and obtained SN Ia production regions of the He star donor channel with metallicities Z = 0.03, 0.02, 0.004 and 0.0001. According to a detailed binary population synthesis approach, we also obtained SN Ia birthrates at various metallicities. Results. Our study shows that both the initial mass of the He donor star and the initial orbital period for SNe Ia increase with metallicity, while the minimum initial mass of the carbon-oxygen white dwarfs producing SNe Ia decreases with metallicity. For a constant star-formation galaxy, SN Ia birthrates increase with metallicity. If a single starburst is assumed, SNe Ia occur systemically earlier and the peak value of the birthrate is larger for a high Z, and the He star donor channel with different metallicities can produce the young SNe Ia with delay times similar to 45-220 Myr.
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]	ACCRETING WHITE-DWARFS ; SINGLE-DEGENERATE CHANNEL ; MASS-RATIO DISTRIBUTION ; SUBDWARF-B-STARS ; LONG DELAY TIMES ; X-RAY SOURCES ; STELLAR EVOLUTION ; SPECTROSCOPIC BINARIES ; SYMBIOTIC CHANNEL ; SHELL SOURCE
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2010/07/aa13976-09/aa13976-09.html
语种	英语
WOS记录号	WOS:000280505000057
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4499]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories/Yunnan Observatory, the Chinese Academy of Sciences, Kunming 650011, PR China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, the Chinese Academy of Sciences, Kunming 650011, PR China 3.Graduate University of the Chinese Academy of Sciences, Beijing 100049, PR China
推荐引用方式 GB/T 7714	Wang B,Han ZW. The helium star donor channel for the progenitors of type Ia supernovae with different metallicities[J]. ASTRONOMY & ASTROPHYSICS,2010,515.
APA	Wang B,&Han ZW.(2010).The helium star donor channel for the progenitors of type Ia supernovae with different metallicities.ASTRONOMY & ASTROPHYSICS,515.
MLA	Wang B,et al."The helium star donor channel for the progenitors of type Ia supernovae with different metallicities".ASTRONOMY & ASTROPHYSICS 515(2010).