Chemical abundances of 15 extrasolar planet host stars

	Chemical abundances of 15 extrasolar planet host stars
	Zhao, G; Chen, YQ; Qiu, HM ; Li, ZW
刊名	ASTRONOMICAL JOURNAL
	2002-10-01
卷号	124 期号:4 页码:2224-2232
关键词	planetary systems stars : abundances stars : late-type
英文摘要	Based on high-resolution, high signal-to-noise ratio spectra, we have derived accurate metallicities for 15 extrasolar planet host stars, as well as differential abundances for 16 other elements. The companions of three stars, HD 29587, HD 98230, and possibly HD 190228, have been shown to have masses in the brown dwarf regime and give an average value of the metallicities [Fe/H] = -0.44 +/- 0.17. If we exclude these three stars, the rest of the sample stars are metal-rich relative to the Sun, covering the range from -0.12 to 0.41, with an average [Fe/H] value of 0.16 +/- 0.17. The stars with planets show a slight overabundance pattern for [Na/Fe], [Mg/Fe], [Al/Fe], and [Sc/Fe]. On the other hand, [C/Fe], [O/Fe], [Si/Fe], [Ca/Fe], [Ti/Fe], [V/Fe], [Cr/Fe], [Ni/Fe], and [Ba/Fe] are approximately solar in the sample. The stars with planets also show underabundances for [K/Fe] and slight overabundances for [Mn/Fe], but stars with brown dwarfs show a contrary trend for these two elements. An interesting result is that sulfur displays enhanced values of [S/Fe], ranging from 0.04 to 0.40 through the sample. These results are used to investigate the connection between giant planets and high metallicity and to probe the influence of this process on the other elements.
收录类别	SCI
语种	英语
WOS记录号	WOS:000178143400032
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8500]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Zhao, G,Chen, YQ,Qiu, HM,et al. Chemical abundances of 15 extrasolar planet host stars[J]. ASTRONOMICAL JOURNAL,2002,124(4):2224-2232.
APA	Zhao, G,Chen, YQ,Qiu, HM,&Li, ZW.(2002).Chemical abundances of 15 extrasolar planet host stars.ASTRONOMICAL JOURNAL,124(4),2224-2232.
MLA	Zhao, G,et al."Chemical abundances of 15 extrasolar planet host stars".ASTRONOMICAL JOURNAL 124.4(2002):2224-2232.