The masses of hot subdwarfs

	The masses of hot subdwarfs
	Zhang XF(张先飞)1,2 ; Chen XF(陈雪飞)1 ; Han ZW(韩占文)1
刊名	ASTRONOMY & ASTROPHYSICS
	2009-09
卷号	504 期号:3 页码:L13-L16
关键词	stars: fundamental parameters stars: horizontal-branch subdwarfs
ISSN号	0004-6361
通讯作者	Zhang, X (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. Masses are a fundamental parameter, but they are not well known for most hot subdwarfs. In general, the mass of a hot subdwarf is derived with asteroseismology or dynamical methods, for which it is often difficult to obtain the necessary data from observations. Aims. We intend to find an approach to deriving the masses of hot subdwarfs from observational data in the literature. Methods. We presented full evolutionary calculations for hot subdwarfs in a wide mass range (0.33 M(circle dot) to 1.4 M(circle dot)) for a Population I metallicity of Z = 0.02, and obtained a relation between M(p) and log (T(eff)(4)/g), where M(p), T(eff), and g are the most probable mass, effective temperature, and gravity. This relation is used to study the masses of some observed hot subdwarfs. Results. We proposed a method of determining the masses of hot subdwarfs. Using this method, we studied the masses of hot subdwarfs from the ESO supernova Ia progenitor survey and Hamburg quasar survey. The study shows that most of subdwarf B stars have masses between 0.42 and 0.54 M(circle dot), whilst most sdO stars are in the range 0.40 similar to 0.55 M(circle dot). Comparing our study to the theoretical mass distributions of Han et al. (2003, MNRAS, 341, 669), we found that sdO stars with mass less than similar to 0.5 M(circle dot) may evolve from sdB stars, whilst most high-mass(>0.5 M(circle dot)) sdO stars result from mergers directly.
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]	HORIZONTAL-BRANCH STARS ; IA PROGENITOR SURVEY ; STELLAR EVOLUTION ; B-STARS ; ATMOSPHERIC PARAMETERS ; STRUCTURAL PARAMETERS ; SDB STARS ; O-STARS ; ORIGIN ; ASTEROSEISMOLOGY
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2009/36/aa12336-09/aa12336-09.html
语种	英语
WOS记录号	WOS:000270180600003
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4467]
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, the Chinese Academy of Sciences, Kunming 650011, PR China 2.Graduate School of the Chinese Academy of Sciences, PR China
推荐引用方式 GB/T 7714	Zhang XF,Chen XF,Han ZW. The masses of hot subdwarfs[J]. ASTRONOMY & ASTROPHYSICS,2009,504(3):L13-L16.
APA	Zhang XF,Chen XF,&Han ZW.(2009).The masses of hot subdwarfs.ASTRONOMY & ASTROPHYSICS,504(3),L13-L16.
MLA	Zhang XF,et al."The masses of hot subdwarfs".ASTRONOMY & ASTROPHYSICS 504.3(2009):L13-L16.