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Chemical abundances of 15 extrasolar planet host stars
Zhao, G; Chen, YQ; Qiu, HM; Li, ZW
2002-10-01
发表期刊ASTRONOMICAL JOURNAL
卷号124期号:4页码:2224-2232
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.
关键词Planetary Systems Stars : Abundances Stars : Late-type
收录类别SCI
语种英语
WOS记录号WOS:000178143400032
引用统计
被引频次:25[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8500
专题光学天文研究部
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
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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.
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