Reappraising the Spite Lithium Plateau Extremely Thin and Marginally Consistent with WMAP.pdfVIP

下载本文档

6
0
约2.35万字
约 12页
2017-04-09 发布于江苏
举报
版权申诉

Reappraising the Spite Lithium Plateau Extremely Thin and Marginally Consistent with WMAP.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Reappraising the Spite Lithium Plateau Extremely Thin and Marginally Consistent with WMAP

a r X i v : a s t r o - p h / 0 4 0 9 3 8 3 v 1 1 5 S e p 2 0 0 4 Submitted to the The Astrophysical Journal Reappraising the Spite Lithium Plateau: Extremely Thin and Marginally Consistent with WMAP Jorge Mele?ndez1 and Iva?n Ram??rez2 ABSTRACT The lithium abundance in 62 halo dwarfs is determined from accurate equiv- alent widths reported in the literature and an improved infrared flux method (IRFM) temperature scale. The Li abundance of 41 plateau stars (those with Teff 6000 K) is found to be independent of temperature and metallicity, with a star-to-star scatter of only 0.06 dex over a broad range of temperatures (6000 K Teff 6800 K) and metallicities (?3.4 [Fe/H] ?1), thus imposing stringent constraints on depletion by mixing and production by Galactic chemi- cal evolution. We find a mean Li plateau abundance of ALi = 2.37 dex ( 7Li/H = 2.34 ×10?10), which, considering errors of the order of 0.1 dex in the absolute abundance scale, is just in borderline agreement with the constraints imposed by the theory of primordial nucleosynthesis and WMAP data (2.51 AWMAPLi 2.66 dex). Subject headings: cosmology: observations - stars: abundances - stars: Popula- tion II 1. Introduction The Li plateau was discovered by Spite Spite (1982), who showed that the 7Li abun- dance obtained from the Li doublet at 6708 A? in F and early G halo dwarfs is independent of temperature and metallicity, suggesting that the Li abundance determined in halo stars represents the primordial abundance from Big Bang nucleosynthesis (BBN). The standard 1Department of Astronomy, Caltech, M/C 105-24, 1200 E. California Blvd, Pasadena, CA 91125; jorge@astro.caltech.edu 2Department of Astronomy, University of Texas at Austin, RLM 15.306, TX 78712-1083; ivan@astro.as.utexas.edu – 2 – theory of BBN predicts the abundance of light elements, in particular 7Li, as a function of the baryon-to-photon ratio η. Thus, if the plateau is primordial, an inverse analysis could be used to determine η (S