中国科学院国家天文台机构知识库
Advanced  
NAOC Open IR  > 光学天文研究部  > 期刊论文
题名:
Sodium abundances in nearby disk stars
作者: Shi Jianrong(施建荣); Gehren, T; Zhao Gang(赵刚)
关键词: line : formation ; line : profiles ; stars : abundances ; stars : late-type ; Galaxy : evolution
刊名: ASTRONOMY & ASTROPHYSICS
发表日期: 2004-08-01
DOI: 10.1051/0004-6361:20040203
卷: 423, 期:2, 页:683-691
收录类别: SCI
英文摘要: We present sodium abundances for a sample of nearby stars. All results have been derived from NLTE statistical equilibrium calculations. The influence of collisional interactions with electrons and hydrogen atoms is evaluated by comparison of the solar spectrum with very precise fits to the Na I line cores. The NLTE effects are more pronounced in metal-poor stars since the statistical equilibrium is dominated by collisions of which at least the electronic component is substantially reduced. The resulting influence on the determination of sodium abundances is in a direction opposite to that found previously for Mg and Al. The NLTE corrections are about -0.1 in thick-disk stars with [Fe/H] similar to -0.6. Our [Na/Fe] abundance ratios are about solar for thick- and thin-disk stars. The increase in [Na/Fe] as a function of [Fe/H] for metal-rich stars found by Edvardsson et a]. (1993) is confirmed. Our results suggest that sodium yields increase with the metallicity, and quite large amounts of sodium may be produced by AGB stars. We find that [Na/Fe] ratios, together with either [Mg/Fe] ratio, kinematic data or stellar evolutionary ages, make possible the individual discrimination between thin- and thick-disk membership.
语种: 英语
WOS记录号: WOS:000223621400034
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bao.ac.cn/handle/114a11/8118
Appears in Collections:光学天文研究部_期刊论文

Files in This Item:

There are no files associated with this item.


作者单位: 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Munich, Inst Astron & Astrophys, D-81679 Munich, Germany

Recommended Citation:
Shi, JR,Gehren, T,Zhao, G. Sodium abundances in nearby disk stars[J]. ASTRONOMY & ASTROPHYSICS,2004,423(2):683-691.
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Shi, JR]'s Articles
[Gehren, T]'s Articles
[Zhao, G]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Shi, JR]‘s Articles
[Gehren, T]‘s Articles
[Zhao, G]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2017  中国科学院国家天文台 - Feedback
Powered by CSpace