DISCOVERY OF SUPER-Li-RICH RED GIANTS IN DWARF SPHEROIDAL GALAXIES
文献类型：期刊论文
| 作者 | Kirby, Evan N.1; Fu, Xiaoting2; Guhathakurta, Puragra3; Deng, Licai2
|
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2012-06-10 |
| 卷号 | 752期号:1 |
| 关键词 | galaxies: dwarf Local Group stars: abundances |
| 英文摘要 | Stars destroy lithium (Li) in their normal evolution. The convective envelopes of evolved red giants reach temperatures of millions of kelvin, hot enough for the Li-7(p, alpha)He-4 reaction to burn Li efficiently. Only about 1% of first-ascent red giantsmore luminous than the luminosity function bump in the red giant branch exhibit A(Li) > 1.5. Nonetheless, Li-rich red giants do exist. We present 15 Li-rich red giants-14 of which are new discoveries-among a sample of 2054 red giants in Milky Way dwarf satellite galaxies. Our sample more than doubles the number of low-mass, metal-poor ([Fe/H] less than or similar to -0.7) Li-rich red giants, and it includes the most-metal-poor Li-enhanced star known ([Fe/H] = -2.82, A(Li)(NLTE) = 3.15). Because most of the stars have Li abundances larger than the universe's primordial value, the Li in these stars must have been created rather than saved from destruction. These Li-rich stars appear like other stars in the same galaxies in every measurable regard other than Li abundance. We consider the possibility that Li enrichment is a universal phase of evolution that affects all stars, and it seems rare only because it is brief. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000304488900016 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6344]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.CALTECH, Pasadena, CA 91125 USA 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA |
| 推荐引用方式 GB/T 7714 | Kirby, Evan N.,Fu, Xiaoting,Guhathakurta, Puragra,et al. DISCOVERY OF SUPER-Li-RICH RED GIANTS IN DWARF SPHEROIDAL GALAXIES[J]. ASTROPHYSICAL JOURNAL LETTERS,2012,752(1). |
| APA | Kirby, Evan N.,Fu, Xiaoting,Guhathakurta, Puragra,&Deng, Licai.(2012).DISCOVERY OF SUPER-Li-RICH RED GIANTS IN DWARF SPHEROIDAL GALAXIES.ASTROPHYSICAL JOURNAL LETTERS,752(1). |
| MLA | Kirby, Evan N.,et al."DISCOVERY OF SUPER-Li-RICH RED GIANTS IN DWARF SPHEROIDAL GALAXIES".ASTROPHYSICAL JOURNAL LETTERS 752.1(2012). |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。