权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

A SYSTEMATIC SURVEY OF CHEMICAL ABUNDANCES AMONG A-TYPE STARS BASED ON HIGH DISPERSION SPECTROSCOPIC DATA

基于高色散光谱数据的A型恒星化学丰度系统调查

基本信息

批准号：
03640250
负责人：
SADAKANE Kouzou
金额：
$ 1.22万
依托单位：
OSAKA KYOIKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

This research project is based on a large body of high dispersion digital spectroscopic data of early type stars obtained at the Dominion Astrophysical Observatory in 1990. The initial motivation has been to carry out a systematic analyzes of many stars using a homogeneous technique. The first stage of the project was devoted to develop a system of data analysis using a Work Station and the IRAF software. After the completion of the data analysis system, several interesting objects have been discovered among the sample stars and detailed studies of these objects were carried out.The first object was a peculiar star HR 1094 exhibiting amomalously strong lines of chroline (Cl) and cobalt (Co). It also shows lines of mercury (Hg) and platinum (Pt) and does not belong to any previously known group of CP stars. The second object was a strong magnetic star HR 7575. As an initial step of analyzing the complex spectrum of this star, an identification list of observed lines has been prepared.The spectrum of a 'normal' A3V star 95 Leo has been analyzed in detail and the star turned out to be a metal deficient star. 95 Leo is the coolest star among previously detected metal deficient stars. The result of chemical abundances of this star will give a constraint on the theoretical interpretation of metal deficient stars.Analysis of other stars are now in progress and the final results will be published in the near future.

这项研究项目是基于1990年在Dominion天体物理天文台获得的大量早期类型恒星的高色散数字光谱数据。最初的动机是使用一种均匀的技术对许多恒星进行系统分析。该项目的第一阶段致力于利用一个工作站和IRAF软件开发一个数据分析系统。数据分析系统完成后，在样本恒星中发现了几个有趣的天体，并对这些天体进行了详细的研究。第一个天体是一颗特殊的恒星HR 1094，它显示出异常强烈的铬线(Cl)和钴(Co)线。它还显示了汞(汞)和铂(铂)的线条，并不属于任何先前已知的CP恒星群。第二个物体是一颗强磁性恒星HR 7575。作为分析这颗恒星复杂光谱的第一步，已经准备了一份观测线条的识别列表。对一颗“正常”的A3V恒星95狮子座的光谱进行了详细的分析，结果表明该恒星是一颗缺乏金属的恒星。狮子座是之前探测到的金属匮乏恒星中最冷的一颗。这颗恒星的化学丰度结果将限制对贫金属星的理论解释。对其他恒星的分析目前正在进行中，最终结果将在不久的将来公布。