论文标题
射手座矮人球星系的广角视图-II。 Sagittarius矮人球形星系中的CEMP-R/S明星
A wide angle view of the Sagittarius dwarf spheroidal galaxy -- II. A CEMP-r/s star in the Sagittarius dwarf Spheroidal Galaxy
论文作者
论文摘要
我们通过uves高分辨率光谱进行了对射手座矮球球星系中发现和化学丰度分析的发现和化学丰度分析。在主体大轴沿SGR DSPH的郊区发现的星星是一个中等金属较差的巨人（t $ _ {eff} $ = 4753 k，log g = 1.75，[fe/h] = -1.55），[c/fe] = 1.13 = 1.13 = 1.13 = 1.13 （[[ba/fe] = 1.4，[eu/fe] = 1.01）。获得了从C到DY的29个元素的丰度。这种化学模式似乎是最好通过一种场景来安装的，在这种情况下，R过程污染事件预先增强了该材料，该材料是在二元系统中以次要的次数出生的，该系统的主要原理通过AGB阶段进化，提供了C和S过程富集。
We report on the discovery and chemical abundance analysis of the first CEMP-r/s star detected in the Sagittarius dwarf Spheroidal Galaxy, by means of UVES high resolution spectra. The star, found in the outskirts of Sgr dSph, along the main body major axis, is a moderately metal poor giant (T$_{eff}$=4753 K, log g=1.75, [Fe/H]=-1.55), with [C/Fe]=1.13 placing it in the so-called "high-carbon band", and strong s-process and r-process enrichment ([Ba/Fe]=1.4, [Eu/Fe]=1.01). Abundances of 29 elements from C to Dy were obtained. The chemical pattern appears to be best fitted by a scenario where an r-process pollution event pre-enriched the material out of which the star was born as secondary in a binary system whose primary evolved through the AGB phase, providing C and s-process enrichment.
