金属丰度

在本文中我们通过AGB星研究了此临界吸积率和金属丰度之间的关系。

In this thesis , we study the relation between the critical accretion rate and the metallicity via AGB stars approach .

本文采用星风质量吸积的角动量守恒模型，并考虑到初始金属丰度对AGB星s-过程核合成的影响，用Monte-Carlo方法研究了弱钡星系统和强钡星系统的轨道根数的变化规律。

Carrying out a series of Monte-Carlo simulations , the works of orbital elements of binaries are recalculated considering the influence of initial metallicity on S-process nucleosynthesis of intrinsic AGB stars , and here we adopt wind accretion scenario with the total angular momentum conservation .

金属丰度对AGB星s-过程核合成参数的影响

Impact of Metal Abundances on S-process Nucleosynthesis Parameters in AGB Stars

晚型星HR5553、εEri和70Oph的活动性、金属丰度和磁场的测定

The metal abundances and magnetic field measurements of late type active stars HR 5553 , ε ERI and 70 OPH

近年来很多工作发现，厚盘恒星的α元素丰度随金属丰度的变化趋势与薄盘不同，这种不同还表现在Al、Mn、Zn、中子俘获元素等其他元素上。

Recent observations show that the abundance patterns of α - elements in the thin and thick disk are distinct , and this difference also appear for some other elements , such as Al , Mn , Zn and neutron-capture elements .

球状星团的金属丰度分布，以及空间分布、运动性质与金属丰度的相关性，提供了球状星团形成过程的信息。除Pb以外，各种重金属含量相关性显著，表明它们有相似的来源。

Observations show that there are tight relations between the distribution and kinetics of GC with their heavy element abundances , which give information on their formation process . The sources of heavy metals are similar except for element Pb .

在较高金属丰度（[Fe／H]≥-1.5）情况下，对于给定的初始金属丰度，较大质量AGB星He壳层内铅的相对丰度并不容易超丰，而质量越小对铅的超丰越有利；

Under the condition of [ Fe / H ] > - 1.5 , at a given metallicity , AGB stars of low mass are easier to display the overabundance of Pb in He shell than those of high mass ;

通过对AGB星演化的模拟，得到在不同金属丰度下的AGB星的初终质量关系及初始质量和初始金属丰度对AGB星重叠因子的影响。

The relation between the initial and final mass of a AGB star with different metallicity and the influence of the initial mass and metallicity to AGB star 's overlap factor were got through modeling the evolution of AGB stars .

铅星作为低金属丰度AGB星的演化产物，由于其初始质量、初始金属丰度需要满足一定条件，因此演化过程既具有AGB星演化的共性，又具有其自身的特性。

As the evolution result of lower metallicity AGB stars , lead stars have not only the common property of AGB stars but also their unique property , because the initial mass and the initial metallicity of lead stars need to satisfy some condition .

近太阳金属丰度恒星的中子俘获元素丰度

The Abundances of Neutron - capture Elements in Stars of Solar Neighbourhood

疏散星团金属丰度样本和银盘金属丰度梯度

Metallicity distribution of open clusters and abundance gradient of the Galactic disc

晚型星系金属丰度与自转速度的关系

Metallicity vs Rotation Velocity in Late - Type Galaxies

金属丰度是表征星系特征的重要参量，对于理解星系的形成与演化具有重要意义。

Metallicity is a fundamental parameter to trace the formation and evolution of galaxies .

恒星重元素丰度随金属丰度的变化规律

The Variation of the Heavy element Abundances in Metal poor Stars with the Metallicity

对给定恒星初始质量情况，较高的金属丰度有利于铅元素的核合成。

At a given mass , the higher metallicity favors the nucleosynthesis of Pb .

球状星团的金属丰度特征与其恒星形成史

Metallicity and Star Formation History of Globular Clusters

年龄和金属丰度是星族的两个重要参数，但两者相互简并。

Age and metallicity are the most important parameters for stellar populations , but they are often found to be degenerated .

银河系的银盘、银晕、核球的平均金属丰度为-0.2，-1.6，-0.2。

The average values of metallicity in the disk , the halo , and Galactic bulge are - 0.2 , - 1.6 , and - 0.2 dex respectively .

恒星系统内变星的平均周期越短系统的年龄越大，金属丰度也越低。

For S Scuti variables in stellar systems the shorter the average period is , the lower the metallicity and the older the age of the stellar system are .

利用瞬时循环近似，考虑元素产率随金属丰度的变化，得出了主要金属元素星系化学演化的分析解。

We model the galactic chemical evolution of primary metal element by using the instantaneous recycling approximation and the yield metal dependent which enable the problem to be handled analytically .

此外还确认了团星系的金属丰度与恒星质量之间的相关性，并推断星系团Abell2255是在单个星系形成后，经过引力相互作用而形成的，这一结果支持了等级成团理论。

The correlation between metallicity and stellar mass of cluster galaxies is also confirmed . It is concluded that galaxy cluster Abell 2255 is formed by the gravitational interaction after the individual galaxies are formed , which supports the hierarchical model of cluster formation .

大洋多金属结核丰度探测方法探讨

An approach to exploration method of ocean polymetallic nodule abundance

通过对原油族组分分离技术测定推断原油中贵金属的丰度特征以及赋存状态。

The abundance characteristice and exist state of precious metals in crude oil were got by the experience of separation of group composition .

贫金属星重元素丰度研究进展

Progress in the Study of Abundances of Heavy Elements in Metal-Poor Stars

贫金属星的表面丰度与慢中子俘获过程

Abundances of Metal-Poor Stars and Slow Neutron - Capture Progress

一种研究贫金属星重元素丰度分布的方法

A method of studying the abundances of heavy elements in metal poor stars

结果显示，快中子俘获过程（r过程）是贫金属星中子俘获元素的主要来源，且金属丰度小于-2.5的贫金属星的重中子俘获元素产量可能来自于纯r过程；

The result shows that the rapid neutron capture process ( r-process ) is the main source of neutron capture elements in poor-metal stars . Besides , the yields of heavy neutron capture elements in stars whose metallicity is less than - 2.5 may come from pure r-process .