| Lithium abundances of nearby solar-like stars | |
PASQUINI, L1; Liu QY(刘清耀)2,3 ; PALLAVICINI, R4
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| 发表期刊 | ASTRONOMY & ASTROPHYSICS
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| 1994-07 | |
| 卷号 | 287期号:1页码:191-205 |
| 产权排序 | 第3完成单位 |
| 收录类别 | SCI |
| 关键词 | Stars Late-type Stars Abundances Sun Abundances Stars Chromospheres |
| 摘要 | We discuss Li abundances in a well defined sample of nearby (G0-G5) solar-like stars. High resolution (R=100,000), high S/N (greater-than-or-equal-to 150) data have been analysed using state-of-the-art techniques and up-to-date atmospheric models. We have investigated whether the abundance of Li in solar-type stars can be described in terms of stellar physical parameters like T(eff), age and metallicity. We confirm the presence of a group of stars with high Li content, but apparently old age, finding that this group is rather conspicuous and not restricted to a few exceptional cases. The analysis of our data, together with published observations of G dwarfs in open clusters, strongly suggests that for stars older than approximately 1 Gyr another parameter in addition to the overmentioned ones plays a relevant role in Li depletion. When this additional mechanism is effective, it depletes Li by a factor 10-100, but in some stars it may not act at all during a large part of their main sequence lifetimes. We make some suggestions as to the nature of this additional parameter but none of them can be definitely proven. When compared to the other stars in our sample, the Sun appears to be representative of the low-Li stars, which comprise about one half of the G dwarfs having stellar parameters and ages similar to the Sun. We confirm that Li is not a good tracer of age for solar-type stars, but we show that a high Li content coupled to high chromospheric activity can be used to identify stars significantly younger than the Hyades. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-6361 |
| URL | 查看原文 |
| WOS记录号 | WOS:A1994NV51400026 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | MAIN-SEQUENCE STARS ; ISOTOPE RATIO ; F-DWARFS ; OPEN CLUSTERS ; K-LINE ; EVOLUTION ; PHOTOMETRY ; DEPLETION ; EMISSION ; ROTATION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4050 |
| 专题 | 其他 |
| 通讯作者 | PASQUINI, L |
| 作者单位 | 1.European Southern Observatory, Casilla 19001, Santiago 19, Chile 2.Copenhagen University Observatory, Brorfeldevej 23, DK-4340 Tollose, Denmark 3.Yunnan Observatory, P.O. Box 110, Kunming, 650011, P.R. of China 4.Arcetri Astrophysical Observatory, Largo Fermi 5, I-50125 Firenze, Italy |
| 推荐引用方式 GB/T 7714 | PASQUINI, L,Liu QY,PALLAVICINI, R. Lithium abundances of nearby solar-like stars[J]. ASTRONOMY & ASTROPHYSICS,1994,287(1):191-205. |
| APA | PASQUINI, L,Liu QY,&PALLAVICINI, R.(1994).Lithium abundances of nearby solar-like stars.ASTRONOMY & ASTROPHYSICS,287(1),191-205. |
| MLA | PASQUINI, L,et al."Lithium abundances of nearby solar-like stars".ASTRONOMY & ASTROPHYSICS 287.1(1994):191-205. |
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| Lithium abundances o（310KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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