Study on a formation and chemical evolution of the Galaxy based on spectroscopic observations of metal-poor stars
基于贫金属恒星光谱观测的星系形成和化学演化研究
基本信息
- 批准号:13640246
- 负责人:
- 金额:$ 1.98万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2001
- 资助国家:日本
- 起止时间:2001 至 2004
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
1. Our spectroscopic studies of alpha- elements, O, Si, S, and Ca, in metal-poor stars were carried out to investigate their behaviors against metalicity [Fe/H]. As for O, the abundance derived from the triplet lines was found to show a flat trend. The behaviors of Si and Ca show a correlated trend and were found to be classified into three groups based on dynamical properties. As for S, our result of an increasing trend with decreasing [Fe/H] in a paper of 2002 was first derived from a large sample, and inspired other groups as well as us to make further studies of S behavior. Our result obtained in a paper of 2005 confirmed that S shows a flat trend in -4 <[Fe/H]<-1, which may be explained by chemical evolution models based on standard supernovae nucleosynthesis.2. Other light elements of Li, Na, and K were also studied and found to provide the new results being different from the previous ones.3. The behavior of Zinc in very metal-poor stars was found to show an increasing trend below [Fe/H]<-3, which gives an important constraints to supernova models.4. The behaviors of r-process elements were found to show a large star-to-star scatter and to be explained by r-process nucleosynthesis. However, an unknown process was needed for an explanation of behaviors of Sr and Ba.5. The most iron-deficient star was discovered. The star may be a population III, or even if not, it gives strong constraints to a nature of the first generation stars in the beginning of the Galaxy.
1. 我们对贫金属恒星中的α -元素O、Si、S和Ca进行了光谱研究,以研究它们对金属丰度[Fe/H]的影响。对于O,从三重系得到的丰度呈平缓趋势。Si和Ca的行为呈相关趋势,根据动力学性质可分为三类。对于S,我们在2002年的一篇论文中得出的[Fe/H]随减小而增加的结果,首先是从一个大样本中得出的,并启发了其他团队和我们进一步研究S的行为。我们在2005年的一篇论文中得到的结果证实,S在-4 <[Fe/H]<-1时呈平坦趋势,这可以用基于标准超新星核合成的化学进化模型来解释。对Li、Na、K等其他轻元素也进行了研究,得到了不同于以往的新结果。锌在非常缺金属的恒星中的行为在[Fe/H]<-3时呈增加趋势,这给超新星模型提供了一个重要的约束。发现r过程元素的行为表现出较大的星间散射,并可以用r过程核合成来解释。然而,需要一个未知的过程来解释Sr和Ba.5的行为。发现了最缺铁的恒星。这颗恒星可能是III星族,即使不是,它也强烈限制了银河系开始时第一代恒星的性质。
项目成果
期刊论文数量(28)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory : A Basis for Spectroscopic Abundance Standards
冈山天体物理观测站附近 F-K 星的高色散光谱收集:光谱丰度标准的基础
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Takeda;Y. et al.
- 通讯作者:Y. et al.
K.Noguchi: "High Dispersion Spectrograph (HDS) for the Subaru Telescope"Pub. Astron. Soc. Japan. 54. 855-864 (2002)
K.Noguchi:“斯巴鲁望远镜的高色散摄谱仪(HDS)”Pub。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Spectroscopic Studies of Extermely Metal-Poor Stars with the Subaru High Dispersion Spectrograph. I. Observational Data
使用斯巴鲁高色散摄谱仪对极度贫金属恒星进行光谱研究。
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:S.Honda
- 通讯作者:S.Honda
Non-LTE Analysis of the Sodium Abundance of Metal-Poor Stars in the Galactic Disk and Halo
银盘和光晕中贫金属恒星钠丰度的非 LTE 分析
- DOI:
- 发表时间:2003
- 期刊:
- 影响因子:0
- 作者:Y.Takeda
- 通讯作者:Y.Takeda
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HIDAI Masahide其他文献
HIDAI Masahide的其他文献
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{{ truncateString('HIDAI Masahide', 18)}}的其他基金
Studies on properties of planet-host stars and on formation conditions of planets based on analyses of chemical compositions.
基于化学成分分析研究行星宿主恒星的性质和行星的形成条件。
- 批准号:
22540255 - 财政年份:2010
- 资助金额:
$ 1.98万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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